My first post, and I'm with the OP. Received my n900 yesterday and am pretty impressed. Things I have tested so far are...

01: wifi
02: tv out
03: still camera
04: video camera
05: media playback
06: xterm gainroot
07: usb data transfer
08: gps
09: t-mobile phone
10: t-mobile internet

...and all work just fine B-)

What I look forward too and wouldn't mind testing:

1: A good file manager...midnight commander would be perfect
2: nfsmount
3: more games such as freeciv