Actually, I don't understand all that speculations about MeeGo on N900. Many times the Nokia guys said that MeeGo is platform. That means that even you are able to run MeeGo on N900 it would still lack some Nokia-specific features anyway. For exam - GSM/3G driver and all stuff. Or else. Nokia can't sell only hardware, they need to fill hardware with something unique, which is attractive to buyers.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...