Click to viewApple has just unveiled mobileme, "Exchange for the rest of us." It gives push email to regular users and syncs all of your data from Mail, iCal, iDisk and Address book to all your devices at once. It works via a new site, me.com (which isn't up as of now). Me.com replaces .Mac and it'll be an automatic update for current .Mac customers.
It's pretty similar to Microsoft's Mesh software. Essentially, it allows you to do things like make appointments on your phone and have them sync your computer and vice versa, and the updates happen in about 10 seconds. The service will cost you $99 a year for 20GB of space, and there'll be a 60 day free trial available at launch in early July.