I've been playing with my Nokia 770 for a couple of days now.
- SSH server on the 770 rules -- I can now access the filesystem using Midnight Commander's Shell Link, or GNOME VFS. Not to mention looking around in the filesystem, editing .profile with a convenient keyboard, etc.
 - The ability to mount NFS shares directly on the 770 rules. I only wish the video player could play any of the random video clips that I try throwing at it. Is anyone planning to port mplayer to the Maemo platform?
 - FBReader's full-screen portrait mode is very nice. It could be improved a bit, but it is already great.
 - The CPU/MEM applet is absolutely essential. So is the clock applet. (How do you differentiate status bar applets and home page applets? It's confusing to call them both applets.)
 - The web browser is quite good.
 - After reading ebooks for about 4 hours, the battery is still at 3/4.
 
Overall impression: the system and applications lack stability, but is quite usable.