[Lizard]

There's a bug where if you enter your iDisk password wrong once, it can just keep asking you. To get out of this, you can delete all the entries in Keychain that store your iDisk password. Quit OmniFocus first. If you open Keychain Access and search for your iDisk user name, you'll probably see a couple Internet password entries that have a name like idisk.mac.com (username). Delete these, and then launch OmniFocus again and start a new sync. It should ask you for your password once, but then stop asking for it again (if you check save in keychain).