Simple answer from me.

It does what I need it to. I don't have take my laptop everywhere. I have access to my work: Skype, Email, Terminal Services.

I have internet radio and MP3, all streaming to the car radio.

I have navigation. I don't get lost as much as I do with the Navman.

If you don't like the N900, RTFM or GTFO, get a refund and buy an iPhone. They are designed for the "sheep" of this world who need features, but to be baby fed them with no freedom.