I just made the switch from a Tmobile Dash (windows mobile 6) to a Tmobile Blackberry curve, and I've had so much trouble finding a way to sync to Google Calendar that I need to come back to make a big recommendation for OggSync. It was downloadable from my phone, easy to setup, free for use with one personal calendar, it worked well/consistently, and it worked OTA (Over the Air)! What more could you ask for?
I highly recommend this, and would love for them to come out with something for Blackberry.
There were many other solutions, but none of them inspired confidence like OggSync and I don't want to sync through Outlook.
- http://spanningsync.com/ (ical)
- How to Sync Google Calendar with Smartphones