I got one! I got one!
Just bought a 5500. It didn't have the stock ROM, though. I'm going to put on the Sharp ROM while I get used to it, then I'll look around and see what else is out there.
Before I get rid of this one, though, I'd like to know what it is in case I want it back later. How can I tell what ROM I'm using?
System Info->Version shows:
Qtopia 1.5.0
Linux Kernel 2.4.18-rmk7-pxa3-emb
Zaurus 0.0
---
Update: I figured it out, accidentally. I rebooted, and the splash screen told me it was The Kompany ROM.