To clarify my novelty statement: I think the N900 novelty will wear off,
I'm already seeing people asking more of the usual Maemo questions again ("How do I get sshfs running?")
and there already seems to be a lot less of the whinging and moaning from the smartphone users going on.
And as for the "incompatibility" questions... again, what specifically are you referring to? Is it the fact that the N900 has hardware features that the N8x0 doesn't have? Or are there apps that you wish you had for the N8x0 that are only found on the N900 (that aren't hardware dependent)?