Is there a direct repo for various Android Build Numbers' update.zip
Some questions, and hopefully some answers:


So you are currently rooted, running one of the earlier leaks of Froyo for the Droid?
You are willing to switch to a mod CM6?
Or do you want to go back to plain vanilla stock without root?


If you are currently rooted and willing to try out a mod like CM6, then go to the Market and downlaod ROM Manager.  Make a Nandroid backup of your phone before you do anything.  Then download and install CM6 via "Download Rom" -> CyanogenMod.  You want 6.0, not the RC version.  When you download and install it, make sure you include Google Apps and wipe your data and cache.

If you are wanting to go back to plain vanilla stock, be noted that apps like EasyRoot (one click root access) will not work for the latest version of Froyo for the Droid.  You'll have to downgrade to 2.1 to get root access back if you go this route.

With that said, if you are rooted, go get ROM Manager.  Under Download Rom are "Stock Images".  One of those options is 2.2 FRG01B with the option of root/unrooted.  This should put you on the right path of plain vanilla stock.

Hope this helps, let me know if I misunderstood you and I'll try to clarify.