Another OTA update is sent out to AT&T and T-Mobile Nexus One owners

Owners of either the T-Mobile or AT&T version of the Nexus One have been receiving OTA downloads of the latest build of Android 2.2. The new build, FRF85B, is being sent out to those who had previously received build FRF83. Some AT&T owners who were still using Android 2.1, build EPE54B, also received the new software, thus skipping the previous FRF83 download. Since both carriers are receiving the same version of Android 2.2 now, we could be seeing the final build of the Froyo upgrade. If you have an N-One and want to check to see if you have received the download, browse to Settings > About phone > System updates and you should receive a notification to download the update. According to the change log, the upgrade will bring to the browser updates for Adobe Flash, support for Exchange in the calendar, tethering options and a bump up in speed.

HTC Nexus One Specifications | Review

source: AndroidandMe