Hello,
Nitdroid N900 FroYo repository is available now at
http://gitorious.org/android-n900

In nearest time all changes to Android's source code will be pushed in
favour of open source development.

In order to build Nitdroid-N900 you need as little as:

mkdir nitdroid
cd nitdroid
repo init -u git://gitorious.org/android-n900/nitdroid_platform_manifest.git
repo sync

(of course I assume you complete all prerequisities)

Participate! Welcome!

btw,
e-yes