A new beta of Android 2.2 Froyo for the Google Nexus One has leaked, courtesy of a source at xda-developers. The new ROM, FRF72, is believed to be the same build as was distributed to Google employees last week, and requires FRF50 be installed first. The FRF72 beta has only been in the wild for a short time, though those who have installed it are reporting that there are no noticeable feature changes in comparison to FRF50.
You can currently download the FRF72 beta from http://android.clients.google.com/packages/passion/signed-passion-FRF72-from-FRF50.bc033f9e.zip; of course Google could well take that down at any moment, though there are mirrors linked here. If you're looking for instructions on how to manually install Froyo, check out the extensive guide over at Android Community.
[via Android Police]