The Fm transmitter, full pc like internet browser like no other phone, hardware qwerty keyboard, ability to play emulator games, how it is hackable so it can be personalised to individual user and their needs, 32gb internal memory for most of music collection videos photos and documents, tv out functionality on which we can watch not just videos but also photos web browsing playing games even doing presentations, after getting my n900 i hardly use my pc or laptop, flashing led indicator to let you know of missed calls ant recieved text messages with differrent colours,etc now best for last the community with loads of great people which help n900 user when they are stuck or having any problems help users persnolise their n900 in unimagined ways still making the n900 better smoother faster fun everyday by new tricks hacks scripts updates without the community this would have not been possible so thanks everyone on this community!!!