I've had an HTC phone before with Windows Mobile OS, and while it wasnt terrible I cant say it was inspiring or something that would make me want to buy another phone with that OS again. Never tried WP7 so cant comment on that one.

If Nokia were to produce another phone with Maemo on it (I know... it wont happen) then I would be interested, cause I do like that OS on my N900, would be happy to use it again.

Sad to see Nokia looking so lost and desperate.