I seem to have fairly consistent problems with the USB locking up on my Mac. It used to happen infrequently on my Mac no matter what I had plugged in (usually coming out of suspend/sleep on the Mac), but the Mac OS X 10.3.3 update seemed to fix that. Now, it only seems to happen when I have my Zaurus plugged into it.
I'm using the driver here:
Has anyone else experienced this?
If there was even just a simple way to reset the USB bus when it happened, I wouldn't mind that much, but it's not. I'll plug and unplug cables, kill the power for and repower my hub, etc. Eventually, meaning after about an hour, it usually comes back.