Here's my take.. of the 'evolution' of whom the n900 was/is/will be most attractive to:

Before it was released: bloggers, bleeding edge collectors, competitors.

First couple of months after release: power users, *nix users, nokia fanboys

After MeeGo was announced: *nix users, fanboys, MeeGo\Qt developers

6 months from now: MeeGo newbies, *nix users, fanboys

1+ years from now: fanboys, bargain hunters