The Android 2.2 update for the Nexus One (FRF85B) was the official Froyo release. Google announced the update this afternoon, stating:
Starting today, Nexus One users will begin to receive the Android 2.2 (codenamed Froyo) over-the-air software update on their phones…In order to access the update, you will receive a message on your phone’s notification bar. Just download the update, wait for it to install, and you should be all set. This update will be rolled out gradually to phones – and most users will receive the notification by the end of the week .
Eugene O'Rourke