Unable to Disconnect (Eject) Network Drive (Share) 10.4.8

Help, please.
Background:
We are running a MacMini in our office that has SAMBA running to share files across both mac and pc space. Works fine, never have a problem with it.
Problem:
However, since the update to 10.4.8, I have now seen (about 4-5 times) the following problem: After being logged onto the Samba Network Share (Network Drive) for the workday (using Airport), the client machine is unable to eject/disconnect the share. In the end, the finder hangs so bad, that we have to power off the mac.
Regression:
(1) I have seen this problem on both a TiBook (10.4.8) and a 1 week old MacBookPro 15.4".
(2) Typically, on first attempt to eject the network drive, I get the finder response that the drive is busy and cannot be ejected. I can quit all open applications, but this does release the drive.
(3) On the second/third attempt, I continue to get the same error message. I can sleep the machine, but I still can't eject the drive. On occasion, the finder hangs and I get spinning BBOD.
(4) On one occasion, I was able to shut Airport off and after a LONG wait, the finder gave up and disconnected the drive (this is similar to how it used to behave in 10.4.7. Not wonderful, but slow and functional).
(5) However, the last few times when Airport was disconnected (or the machine was sleeped and then awoken elsewhere) the spinning BBOD remained and the finder was completely unresponsive. In this case, I am unable to even force quit the finder, turn airport back on, or anything at all. This results in me having to force power off the machines...an embarrasment for a mac enthusiast.
Questions:
(1) Any thoughts?
(2) Is there a command line tool that allows me to "snoop" and figure out which process is tying up the network shares?
(3) After the force power-off, which logfile or crashreporter should I be looking at so that I can send it in to help track the problem down?
Thanks all!
TiBook Mac OS X (10.4.8) Also seen on MacBookPro 15.4"

BDAqua,
Thanks for the link to Applejack. I've run it twice (once manual, and once in full AUTO deep clean). It fixed some pref's, but didn't find any problems with the disk or anything.
Let's see where that puts us...
Further Regression
(1) I can re-create the problem by inserting a CD-ROM or connecting to a network SAMBA share.
(2) On a FRESH BOOT, I can eject, re-insert and eject the CD-ROM with no problem at the login screen. However, once I've logged into an account (any account will do), I am no longer able to eject the CD even if I log back off.
(3) I have noticed that when I try to eject the CD-ROM I get another instance of diskarbitrationd launching (for 2 instances total). Not sure if this is normal or not.
(4) I have tried to run "sudo diskarbitrationd -d" from terminal to get some debug info, but it always responds with "service is already running". Even a -SIGHUP won't allow me to relaunch diskarbitrationd (since it autolaunches immediately)
(5) I trolled through /var/log for anything interesting but could only find something in the system.log. Mar 8 08:37:22 MyDrive kernel[0]: disk0s3: I/O error. The interesting thing is disk0s3 is my internal drive.
(6) I took a look at pdisk to see what I could see. rdisk0s3 is definitely the main partition on my internal HD. It is unable to read the partition map of the CD (rdisk1). I'm not sure if this is normal for CD-ROMs or not.
(7) I've trolled through /etc/mach_init.d and a few other places where diskarbitrationd things lie. Not sure what to look for but didn't find anything interesting.
So....if anybody has an idea on what service to look at or try to get debug info out of (or how to get diskarbitrationd to actually enter debug mode...) I'd be hella thankful.
-Red

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