Google has release a Mobile Sync program which allows you to backup and sync calenders and your address book.  The application is available for iPhone, Blackberry, Windows Mobile and Symbian platforms.  See the video for details and the features below. 

If Google gives us a "Back to My Mac" solution and some decent online storage, then why pay for MobileMe? This could be a great thing, or maybe Google already has too much of our info.  What do you think?

Features

Synchronize your contacts. Get your Google contacts quickly and easily to your phone. With Sync, you can have access to your address book at anytime and place that you need it.

Get calendar alerts. Using your phone’s native calendar, you can now access your Google calendar, and be alerted for upcoming appointments with sound or vibration.

Always in sync. Your contacts stay synchronized whether you access them from your phone or from your computer. Add or edit contact information right on your device or on your Google account on the web.

[Google]