Here's a pretty thoughtful and extensive review of the N900 on The Nokia Blog:

http://thenokiablog.com/2009/11/13/nokia-n900-review/

The reviewer's been using the phone for a month, has the latest firmware, and is reporting on his experience. Mostly he sees the N900 as the best web browsing and phone combination out there. Not as good for some other functions, like music and apps.

As a small note, he surprisingly says that the speakers are not as good as those on the Droid. One person claimed, in another thread here, that the N900's thickness is in part due to the speakers and how you can't have good speaker quality in a super thin device. This guy is definitely a long time Nokia user and fan, so it seems like he's not just looking for an excuse to praise the Droid. So I'm a little surprised that the N900 didn't measure up to the Droid in this respect.

Anyway, there's a lot in the review though, both praise and criticism. It's worth the read.