Some Google Nexus One owners  at XDA developers forum are getting another Over the Air update for Android 2.2.   We know that google gave only nexus ones an Android 2.2 updates last week, but it was pushing another another update yesterday.

We are not sure what this update will do or any improvements or features it added.  But you can follow this topics for any update.s

Posted by Jameslegg:

FRF91 OTA just turned up on my un-rooted nexus one - not sure whats included, I already had the FRF85B OTA update earlier this week to take me from my manually (but officially google sourced) beta builds of FROYO iAnybody else seen this?

Cheers
James

source: xda-developers