Hey All,
I think there's a repeatable bug in OS X, and was looking for some confirmation. Here's how you do it:
1) Turn on full keyboard access
2) Start a program that's not the Finder
3) Minimize or close all windows so that you've just got the desktop but are in another program (like if you only have mail and the finder running and you hit Apple-W to close the window but haven't switched to the Finder)
4) Press ctrl-w (not apple-w) to "switch windows" (or whatever keystroke you have "switch window set to in full keyboard access.)
Your system should now hang. You can move the mouse pointer around but you can't click on anything. It is also unresponsive to any keystroke (like apple-option-escape or apple-q)
Let me know if it "works" for you. It does it for me no matter what program (other than just the finder) I use. I didn't experience this problem in 10.2.4, but I'm not sure I ever tried it either. I first experienced it in 10.2.5 and though I submitted it to apple via the feedback website, it's still present in 10.2.6.