So far the issues that I've found:

Konquerer browser: going to http://www.internettablettalk.com freezes the n800. Pretty consistently, too. First time I've ever had to take the battery out, since nothing else worked.

"Right click" on the n800 is the little Home button. Sweet!

Microb got the updating screen and a blank screen, but didn't seem to come up.

That's about all I've had time to try, so far. Sorry for being so slow to test, but this troublesome activity gets in my way of life: work!