I gotta chime in here... I also purchased an N800 and am overall very satisfied with it. The thing is amazingly capable, especially when paired with a bluetooth keyboard. I use the Think Outside XTBTUE keyboard. The keyboard folds up to a size not much larger than the N800. I can walk around with an 802.11b/g capable, fully functional Debian based machine in my pocket, with ssh, vnc, and a keyboard that I can type on at full speed.
To be honest though, I think what really was the catalyst for my purchase was the desire to show my support for companies willing to empower and work with
the opensource community, rather than against it (which is also why I purchased a SqueezeBox,
another company willing to work with their opensource customers.) Check out maemo.org for a glimpse of the N800 development community.
Nokia even had a program
where they allowed 500 active opensource contributors to purchase an N800 for only $99.
PS. Hear that companies? I vote with my wallet and will gladly give my money to companies that embrace opensource software.