Android 2.2.1 released for Nexus One

[kag]

Android 2.2.1 Update Appears for Nexus One | xda-developers

[surajkala]

Any idea.. whats r new additions to it.. or just the bug fixes

[H3LLBOY911]

Just bug fixes.
I wrote about it yesterday on sandroid turbo thread .

[Empas]

bugfixes and updated email client

[quazar]

This update contain the solution fix for the problem "Can't establish a reliable data connection to the server" when trying to connect to your google account as reported on google android forum , It has been reported that it patches the vulnerability that allows Universal Androot to work. Several users with alternative keyboards have reported some issues, but a simple reinstall of the keyboard app appears to resolve all problems.

Don't know if they find other improvements though,