This is the Official 2.2 FRG22D OTA patch that will be pushed to Droid 1 devices. The download is on Googles server so do not worry about the warning when navigating to the download page..
It's a very small patch (1.63MB) which enables you to "see" Adobe Flash in the Market and a security patch (unknown) This patch will update you from FRG01B to FRG22D and bring you current.
**UPDATE: If you are still on 2.1 and want the FULL Update (FRG01B patched to FRG22D) DOWNLOAD FROM GOOGLES SERVER.**
Install guide using PC (compliments of Android forums)
Install without using PC/Mac (credit above)