If you thought running Android on a N900 was a nifty hack, you should check out this video of OS X 10.3 running in emulation on the N900. It’s dog-slow, but it does boot and goes to show that you’ll want a better interface when you start using smaller screens.
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This is perverted (but in a nifty way).
However, what I *REALLY* want to see is someone figuring out how to replace Android on an Android phone with Maemo (the N900′s default OS).
(I’m aching for a maemo-based phone, but am nowhere near wealthy enough to afford $750 for an N900…)