This update supersedes the previous Froyo build (FRF50) that was rolled out to a limited number of Nexus One handsets for testing.
If you have build FRF50, you can download the manual update from Google, here.
If you are running build FRF72 or Android 2.1, hang in there: the build should eventually roll out to your phone, if it hasn’t already.
Eager to upgrade? Go to Settings > About phone > System Updates to see if there’s a download waiting for you.
This update comes after Google open-sourced Android 2.2, and delivered the build to their many partners around the world. Meaning that it won’t be too long until it starts rolling out to the other (eligible) Android handsets out there, or until the Android hacking/tweaking community start doing wonderful things with the source code.
[via Android and Me]