BIG NO AGAIN
Correct me if I am wrong

: as I am on 2.3.4, my bootloader is upgraded and can not flash back to 1.8.3 as can not downgrade the bootloader -> from now on, I can only use the new rom with new bootloader, i.e.. official 2.3.4 from AT&T. I can switch between flashable zip files and Ken's files withou any problems because they are on the same bootloader. This is similar to iPhone. When upgrading to new iOS, we can not restore to the previous one
What I need to do now is to enjoy the current 2.3.4 and wait for the official release from AT&T
Sorry I didnt saw ur post and edited a lot mine above yours hehehe...
Anyway I agree with you BUT with one little (in fact HUGE) concern... some months ago when I was upgrading OTA from 1.57 to 1.83 officially it stoped me because I was rooted and had my webtop modded... I must admit that I was lazy and did a flash of a stock 1.57 version what allowed me to upgrade smoothly... I've said lazy because I knew that everything that I'd done was revertable by changing some files here and there... but I choose to flash the sbf instead..
Now my concern (I am suffering in antecipation I know

): Do you think Motorola will allow us to update our system with a "non-official" gingerbread 4.5.91 installed that was never released?
I bet u know the answer already...