Macbook Pro repeatedly waking from sleep with the clamshell closed

This is the second of two Macbook Pros that have inexplicably begun waking themselves from sleep with the clamshell closed. This continues until I either reboot, or unplug the power cord. Yes, that's right, unplugging the power cord stops the behavior EVERY TIME. The system log shows the reason for waking up as being: EHC1, EHC2 (USB Ports), however there is nothing plugged into the computer.
The first computer was replaced under warranty by Apple when they couldn't diagnose or fix the problem. This computer, however, is out of warranty. Any suggestions outside of the obvious (reinstall system software, repair permissions, check power management settings, etc) would be helpful.

Thank you for the very comprehensive list of possibilities. There are no wake events scheduled and even if there were, the fact that it happens randomly rules that possibility out. I originally thought (when it started to happen with my first Macbook Pro) that it had something to do with the power manager due to my recent installation of Alarm Clock Pro, which requires the user to wake the computer before the alarm goes off. However, after a complete wipe and fresh install of the OS (with no apps installed), it continued to wake itself up.
I greatly appreciate you clueing me in on the fact that the USB ports are not powered while asleep when the power cord is unattached. I did not know this and even the Applecare folks failed to mention it when they were troubleshooting it.
I don't use Bluetooth and always leave it off. However, I had heard that this was a symptom of Bluetooth becoming unavailable so I checked when this started happening and my Bluetooth is unaffected (I even turned it on and paired something to be sure).
I never plug a printer into the USB ports as I always use Bonjour with a printer plugged into Airport.
Thanks again for your suggestions. I will read those threads again. perhaps I missed something the first time.
-Tom
Edit: I have never seen that second thread you linked! I am very hopeful that it may solve my problem. I will post back here after I give it a try.
Again, thank you.
Message was edited by: Thomas Slayton

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    Jun 26 13:19:38 philipp-knobelspiess-macbook-pro TextMate[56798]: Will try again in one hour
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    Jun 26 13:19:51 philipp-knobelspiess-macbook-pro kernel[0]: IOBlockStorageDriver[IOBlockStorageDriver]; executeRequest: request failed to start!
    Jun 26 13:19:51 philipp-knobelspiess-macbook-pro kernel[0]: disk1s2: device/channel is not attached.
    Jun 26 13:19:51 philipp-knobelspiess-macbook-pro kernel[0]:
    Jun 26 13:19:52: --- last message repeated 1 time ---
    Jun 26 13:19:52 philipp-knobelspiess-macbook-pro kernel[0]: jnl: disk1s2: close: journal 0x6ed7d10, is invalid. aborting outstanding transactions
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    Hey, thanks 4 your response... Well I figured that out... I hoped that there was a way to prevent system calls, regarding devices, to wake up my macbook pro... something like: forbid interrupts while asleep
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    I think a solution would be to disable automount on the express card device... I use it for my time machine backup and really DON'T want to remove the card every five minutes...
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    I have had both my IMac and MacBook Pro freeze upon waking from sleep recently. Occurred only after installing latest Lion upgrade. Very frustrating since requires hard reboot ronin case of the MacBook Pro, reinstalling the OS. I have noticed similar complaints by others. Any suggestions for a fix other than waiting for a new release?

    Launch the Terminal application in any of the following ways:
    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Terminal in the page that opens.
    Drag or copy – do not type – the following line into the Terminal window, then press return:
    pmset -g
    Post any lines of output that appear below what you entered – the text, please, not a screenshot.

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    Last September my MBP went to service for a dead fan, a corroded top case and a whine problem (which was not fixed!). Ever since the machine has been randomly waking from sleep. Sometimes just picking up the machine will make it wake up. But the big problem is that it often wakes up while in my bag during my daily transits! Obviously I am highly concerned for both the heat and the hard drive. I have just reinstalled the entire OS, reset the PRAM and SMC, but to no avail. The machine still acts the same way! What is going on? The machine is always safely in sleep (most of the time in hibernate mode) when this happens. I can clearly hear the fans and drives are off when I put it in my bag; so the problem is not that it's not going to sleep.
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    P.S. I've got my Apple Care box just waiting to get registered... I seriously wished I wouldn't have had to use it so soon... Not to mention that my already recalled battery is not holding its charge, despite pmset reporting the status are Good/Good!
    MacBook Pro 15" rev 1,1   Mac OS X (10.4.9)   ROM MBP11.0055.B08, SMC 1.2f10

    Hello there DaveWoo,
    It sounds like your computer is occasionally restarting on its own when you wake it from sleep. There can be a number of reasons for this to happen, and I recommend you use the following article to help you resolve or isolate the issue. Its pretty thorough and has a lot of information.
    OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
    http://support.apple.com/kb/HT200553?viewlocale=en_US
    Thank you for using Apple Support Communities.
    All the best,
    Sterling

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