Yeah, I pulled it for a short while and everything seemed fine. However, I was needing to back up a couple USB drives and the USB 1.0 speeds were pretty excruciating so I put it back in.

I went ahead and reinstalled Tiger on the dual-boot drive this morning and so far everything is working (with the USB 2.0 card still plugged in). I think I'll need to go through a few cycles of switching start-up disks and rebooting before I know for sure if my previous Tiger install got corrupted or something. (I was getting disk errors in 9.2.2 which coincided with the USB problems, maybe not related but who knows?)