Nexus One can already upgrade to the Android 2.2!

Update 1: Root unit has Nexus One can upgrade to the Android 2.2, there are other sites have provided links to the files and the detailed steps we can to winandmac see
Update 2: New Links: http://www.mediafire.com/?k0z44zkjv5z
Wait a few days, and finally appeared in the updated Android 2.2 FroYo! Impatient users can manually update their own way through the following: (Note: not only can users Root machine)

1. The first link to download the needed files.
2. Will be downloaded and signed-passion-FRF50-from-ERE27.1e519a24.zip please renamed update.zip (file name must be update.zip, rather than update.zip.zip), the final copy to the MicroSD card.
3. Press the power system the Nexus One off.
4. Press the "Volume -" the system and power system so that the Nexus One starts again.
5. Boot, the screen displays the system is searching for files, then scroll to the end (using the "Volume + / -" move up and down), select the Recovery and press the power system.
6. Will then see the screen in the middle of an exclamation point of a triangle, then press the power system to the same time, and "Volume +" system.
7. Then select Apply sdcard: update.zip.
8. Such as a child back, the screen will display "install from sdcard complete", the update is complete. Just make sure "reboot system now" will be done!

After successfully updated, of course, to download Flash 10.1 it! There are two ways to download, 1). May be to Android Market to "Flash Player" and "Adobe" keywords to search for and download and install. 2). Please use the phone browser link to http://get.adobe.com/flashplayer/ , select the "Agree and install now" task can be done!
Nexus One of the users of Android 2.2 Come and experience the power of it!