Google Sync is Awesome!
I downloaded Google Sync today on my Blackberry. If you use the Google Calendar, Google Sync will update your online Google calendar with your blackberry calendar. You can find it at http://mobile.google.com from your phone
You may have to download a patch for your software which you can download from your blackberry at http://www.blackberry.com/calendarpatch it may take a couple of tries and a minute or two to get to the download page.
When I was notified to update my patch, I was directed to http://www.blackberry.com/calendarpatch2007 which has all the info.