Fix for MobileMe Keychain Sync

Here’s my fix for the MobileMe keychain sync process wanting to delete all keychain items:

1. Set sync mode to manual on all computers
2. Reset MobileMe keychain sync on a known good keychain computer
3. Open Keychain Access on other computers and delete the affected keychain
4. Create a new keychain with the same name
5. Set new keychain as default and enable MobileMe sync in the Keychain settings
6. Sync, and choose the option “replace data on computer”

Complete the testing with a few back and forth syncs to make sure that a large number of changes aren’t detected.  (This technique works well for other sync types, but deleting the data can be much more complicated depending on how it is stored.)