Other specs worth mentioning: Carl Zeiss 5 megapixels camera with dual-LED flash, 3.5" 800x480 WVGA screen, 1GB application memory (wow!) and slide out QWERTY keyboard.
Here's a hands-on video from which I noticed an interesting way to zoom in and out of the Mozilla based browser with one finger since N900 still do not have multi-touch:
Another thing that caught my attention was that assuming this whole demo was recorded in a room, I was quite amazed how the GPS could tag the photo... maybe from last known position when the phone was outdoors? :P
First read about it from Mobile Industry Review.