I was reading up on the new IoS upgrade coming to the iPhones and I got a glimpse of an article saying android 3.0 unofficially released to nexus one.. apparently its true and here is the link to download it. I wouldn't do it though...
[ROM-DEV] Honeycomb SDK port to N1 alpha 3 [02/27/2011] - xda-developers
[ROM-DEV] Honeycomb SDK port to N1 alpha 3 [02/27/2011] - xda-developers