What's the deal with all of this root talk?
If this is indeed an official update.zip, it will work in stock recovery, so you don't need root to load it. If you need root, it's not the official update.
I guess there is some fuzzy space if you have the previous 2.2 OTA update and a custom recovery (easy root does install a custom recovery, right?) somehow doesn't do the version checking before installing??? Otherwise, I don't see how root vs non-root would make a difference.
Also, I find it interesting that this thread is 8 pages long of people jumping on this update and a total of 1 or 2 people have reported receiving this update OTA.
Anyway, continue on ...