The Problem:
Switching Mobileme username caused a pesky PROPFIND error, and OmniFocus would no longer sync on the iPhone or iPad.
The Solution:
Reset the keychain with this link, then you will get a prompt for a username and password where you can use the new credentials.
http://people.omnigroup.com/kc/DebugOmniFocus/ResetKeychain.html
(Found on OmniFocus support forums)
Incidentally, I had the same bug with the desktop version on the Mac. Fixing this problem required removing all MobileMe certificates for the old user, by searching through Keychain Access.
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