Apache refuses to run all of a sudden. How to debug?

I'm having a very strange issue I've never run into before. Snow Leopard 10.6.8
After doing web development on a MBP 17" for years, suddenly Apache will not start up.
I run the default Apple Apache install via Web Sharing, with a few added PHP extensions - mcrypt, memcache, nothing crazy.
I haven't changed anything in the configuration for months.
Web Sharing preferences says Web Sharing is running.
I have NameVirtualHost on and several dozen sites in ~/Sites/sitename.com - again, all working great for years.
Skype is not running and stealing port 80.
MacbookPro:~ me$ ping localhost
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.070 ms
MacbookPro:~ me$ sudo apachectl configtest
Password:
Syntax OK
MacbookPro:~ me$ telnet localhost 80
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
MacbookPro:~ me$ ps aux | grep httpd
me     981   0.0  0.0  2435548     12 s000  R+    6:47PM   0:00.00 grep httpd
MacbookPro:~ me$ sudo apachectl start
Password:
org.apache.httpd: Already loaded
Any ideas?

Wow, I feel silly.
I was tailing the wrong log file.
Tailed the right log file, reloaded http://localhost/ and Apache was not able to write one of the vhost domain log files:
tail -f
/private/var/log/apache2/error_log
(2)No such file or directory: httpd: could not open error log file /Users/me/Sites/logs/sample.com/logs/error.log.
Fixed the path to the error log file path in the sample.com vhost container... and restarted Apache.
sudo apachectl restart
I guess I didn't realize before that 1 issue with 1 vhost (in a config with dozens of virtual hosts) can bring down apache completely for all vhosts.
Good to know! Problem solved.

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    17/08/2012 22:58:30.108 configd: network configuration changed.
    17/08/2012 22:58:31.102 ntpd: proto: precision = 1.000 usec
    17/08/2012 22:58:34.116 UserEventAgent: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Probe
    17/08/2012 22:58:34.117 UserEventAgent: CaptiveNetworkSupport:CNSPreferences:60 Creating new preferences
    17/08/2012 22:58:34.117 UserEventAgent: CaptiveNetworkSupport:CaptiveStartDetect:2343 Bypassing probe on WLAN_D0BD because it is protected and not on the exception list
    17/08/2012 22:58:34.119 UserEventAgent: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Unknown
    17/08/2012 22:58:34.121 configd: network configuration changed.
    17/08/2012 22:58:36.581 com.apple.launchd: (com.apple.xprotectupdater[21]) Exited with code: 252
    17/08/2012 22:58:37.443 loginwindow: **DMPROXY** Found `/System/Library/CoreServices/DMProxy'.
    17/08/2012 22:59:38.200 warmd: [warmctl_evt_timer_bc_activation_timeout:260] BC activation bcstop timer fired!
    17/08/2012 23:00:30.000 kernel: disk0s2: I/O error.
    17/08/2012 23:00:32.977 ReportCrash: DebugSymbols was unable to start a spotlight query: spotlight is not responding or disabled.
    17/08/2012 23:00:34.378 com.apple.launchd: (com.apple.coreservicesd[57]) Job appears to have crashed: Bus error: 10
    17/08/2012 23:00:34.380 mdworker: checkinWithServer(), failed checking in with coreservicesd, err=#-308/0xfffffecc (ipc/mig) server died serverPort=0x0 opts=0x0
    17/08/2012 23:00:34.380 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:34.385 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:34.385 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.319 mdworker: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a0 uid=0 euid=0
    17/08/2012 23:00:35.607 ReportCrash: Saved crash report for coreservicesd[57] version ??? (???) to /Library/Logs/DiagnosticReports/coreservicesd_2012-08-17-230035_localhost.crash
    17/08/2012 23:00:36.768 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:00:36.784 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:00:36.784 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:00:36.784 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:00:47.145 com.apple.launchctl.LoginWindow: com.apple.findmymacmessenger: Already loaded
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: LaunchServices/5123589: Unable to lookup coreservices session port for session 0x186a5 uid=0 euid=0
    17/08/2012 23:01:29.381 loginwindow: _RegisterApplication(), unable to get application ASN from coreservicesd, and this application requires an ASN, so aborting.  error=#-1.
    17/08/2012 23:01:29.382 com.apple.loginwindow: _RegisterApplication(), unable to get application ASN from coreservicesd, and this application requires an ASN, so aborting.  error=#-1.
    17/08/2012 23:02:38.676 com.apple.launchd: (com.apple.loginwindow[36]) Job appears to have crashed: Abort trap: 6
    17/08/2012 23:02:38.738 loginwindow: Login Window Application Started
    17/08/2012 23:02:38.916 WindowServer: Unable to open IOHIDSystem (e00002bd)
    17/08/2012 23:02:38.950 loginwindow: **DMPROXY** Found `/System/Library/CoreServices/DMProxy'.
    17/08/2012 23:02:39.031 com.apple.launchctl.LoginWindow: com.apple.findmymacmessenger: Already loaded
    17/08/2012 23:02:39.104 ReportCrash: Saved crash report for loginwindow[36] version ??? (???) to /Library/Logs/DiagnosticReports/loginwindow_2012-08-17-230239_localhost.crash
    17/08/2012 23:02:39.195 airportd: _doAutoJoin: Already associated to “WLAN_D0BD”. Bailing on auto-join.
    17/08/2012 23:02:39.000 kernel: virtual bool IOHIDEventSystemUserClient::initWithTask(task*, void*, UInt32): Client task not privileged to open IOHIDSystem for mapping memory (e00002c1)
    17/08/2012 23:02:39.886 com.apple.SecurityServer: Session 100006 created
    17/08/2012 23:02:39.889 loginwindow: Login Window Started Security Agent

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