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To synchronize your keychain on this computer
/System/Library/Frameworks/SecurityFoundation.framework/Versions/A/kcSync.app/Contents/MacOS/kcSync -reset
I was having trouble with a syncing my keychains via MobileMe today (first time syncing). MobileMe prompted me that I needed to input a password for the computer this keychain was stored on. Unfortunately, it didn’t list a computer that the password was for, and none of my passwords worked. Eventually, I found this mailing list entry which had this command, and solved my issue.
Upon entering the command in your Terminal, hit cancel on the popup. It’ll then reset, and you can continue syncing.
