IT'S THE ONLY FREE SYNC APP I'VE EVER FOUND THAT CAN BACKUP MY BLACKBERRY'S NOTES WITHOUT A USB CABLE! AND THAT'S GREAT BECAUSE I LOST A FEW IMPORTANT NOTES (EG GREAT BUSINESS IDEAS) BECAUSE I WASN'T DOING DAILY BLACKBERRY DESKTOP MANAGER BACKUPS THROUGH USB!
Since they just released the Blackberry app, I've noticed the web interface isn't always online. Also the blackberry app and the service is still beta, so continue using Google Sync or m:IQ (eg miqlive) as well!
You can even host your own funambol server, in case you don't want your phone's data "in the cloud"! If you run your own sync server you can even synchronize with Microsoft Exchange, Google Contacts, Zimbra, or Yahoo!.