anyone know how to un-update my wow to use the 3.0.9 patch without downloading all the patches again?

It is best to make separate folders if you have the room. I got 3 at 3.0.9 3.1.0 and 3.1.3. I just copied the folder - pulled out the updater of the original version and bingo - was done. To down grade I would make a second copy - pull out the patches - then run repair and see what happens

yeah except they fixed that, so people cant downgrade now. since they ran out of lawsuit power, they just stopped making it easy for people to connect.... shame really....

How to Down Grade (Working method as of Sept,2009)
1) Open your wow folder
2) Open Data folder
3) Remove file “patch.MPQ”
4) In your wow folder - remove all Blizzard Downloader and Blizzard Updater to the patch you want to run on. Downloader has the tornado pic and Updater has the shooting star pic.
5) In your wow folder run repair by using “Reset and Check files”
6) Now you are at 3.0.1
7) Starting in sequence double click your Blizzard Updater and install patches. Just keep running up thought the patch to get to where you want. Example (WoW-3.0.2.9056-to3.0.3.91...Blizzard Updater)
8) Change your realm list and have fun playing on a new server.
This should take no more then a hour.