Android 2.2 Froyo – now available for Nexus One for real
This release is named FRF85 and it seems some Nexus One owners running on AT&T are receiving the update OTA today.
If you are on any other carrier and still want to install Froyo on your Android device, you can go to this Google link(link removed by Google, sorry!) and download the latest build from there.
The official blog post regarding this Froyo release from Google can be seen here.