USB Hell

I'm in USB Hell right now.  I bought a USB hard disk (it also has a Firewire interface, but the stupid makers of Firewire decided to have two cable standards, so I have to wait for the right cable to arrive).  I can't unmount the hard disk for some unknown reason (Windows says to "try again later".  Thanks!).  So out of desperation, I unplugged it, and now I can't use that USB port for anything else.

Add to the fact that I just bought a D-Link 7-port USB hub, which ocassionally (5-10 times per day) flakes out and needs to be unplugged and plugged in again, and it's USB Hell.  How many USB devices do I have?  Let's see.  A mouse, hard disk, 2 card readers, USB->serial cable adapter, and numerous Palms.  Argh!