Looks like Apple is preparing to rename .Mac to “Mobile Me”.
.Mac is a decent idea that falls way short of its potential. I hope that a significant upgrade is in the works.
Synchronizing data between multiple Macs (home and work, desktop and laptop, etc.) is pretty painful outside of the realm of .Mac’s supported data types (contacts, calendar, mail). It would be amazing if, someday, there was a larger synchronization platform from Apple that would incorporate iTunes- and iPhoto-library bidirectional sync, plus maybe a general home-directory sync option (or just certain folders).
Imagine if .Mac/Mobile Me would store your libraries and data on the internet somewhere, handling backup and versioning automatically with a remote Time Machine interface, with seamless integration with iLife. I’d gladly pay $30-60/month for that.