There has been only one real issue with the USB stack this entire time - one of data corruption that I never personally saw, but Dave the Firmware Guy was able to reliably reproduce. Teaming up with the USB library developers, they found and corrected the problem - so now we're all banging away at our USB drives, making sure that's the only problem out there. That's why there's beta tests. :-)
I took the team on a tiny little diversion for a couple of days for a little project I have up my sleeve, but now the "last" thing to focus on are the little outboard disk-switch buttons. Oh, and of course the other bugs the beta testers come up with. :-)