@switchfiend and @nosa as far i know for the g1 the really first android device it is able to get a 2.1 android too?

look here sorry i only have a german link maybe you can translate it by yourselve.

http://de.engadget.com/2010/05/03/an...-installieren/

so have fun i hope i was able to help you.

*edit* sorry just saw your last comment to late switchfiend.