I didn't see this posted yet, but thought it was actually a pretty fair and even review (not something frequently associated with Engadget reviews):

http://www.engadget.com/2010/01/19/nokia-n900-review/

For the long and short of it, they like the potential of the N900, think Maemo is very promising, but don't recommend the phone to "joe average" users (not a surprise, really).