iSync: really not ready

Mac OS X 10.4, .Mac: Put URLs in the Notes field for Address Book syncing

Any information in an Address Book contact's URL field will not be synced between Address Book and .Mac, but data in the Notes field will be.

This is really embarassing - for Apple. Sync is hard (indeed, sync between data models may be impossible), but it seems like iSync development has been rather underfunded.