The Missing Sync for Symbian syncs personal information such as contacts, calendar tasks, and events, and also uses proprietary Call Log and SMS applications to move the phone's call log and text messages to the Mac. Video, photo, music, and document files can also be synced.
If you think that the iPhone is the only smartphone on the market, it's important to realize that well over 100 million Symbian-based phones have been sold worldwide, with Nokia, Sony Ericsson, and Motorola being the biggest vendors. As a result, the Missing Sync for Symbian is available in English, French, Italian, German, and Spanish versions.
In the interest of full disclosure, I wrote the help system for this application under contract to Mark/Space.