dj_steve @ TMO has got Android 2.2 (aka Froyo) OS running on the Nokia N900 mobile phone and have posted a teaser video to show how it runs. (project name is Nitroid) This is just a taste of what is to come and dj_steve is working hard to get Android to be a fully useable replacement OS for the Nokia N900. Considering it already can be setup to dual boot between its original Maemo5 OS and Android, this project is becoming far more promising for the N900 users worldwide. (Not to mention the upcoming MeeGo OS that may also be a full alternative OS for the N900)
You can follow dj_steve’s progress at his twitter page.
UPDATE: Official Nitdroid website/forum – http://nitdroid.com
UPDATE: – Adobe Flash 10.1 is also working in the web browser although not very fast and not stable in some sites such as youtube.
UPDATE NOV 2011 :
Gingerbread 2.3.4 now works near perfectly on the N900.
Pretty much all games works and you can even send/receive SMS as well.
See here for most up to date information and how to: