I am currently using Google Sync v 0.5.15 and see the new version 0.7.2 is out but I cannot find out how to upgrade. I've gone into Applications and looked there and nothing......if I open Google Sync and the menu key there is no option for "check for update" or something similar.........
Go to m.google.com from your bb browser and download the new one. The only difference I can see is that it allows you to sync up to one year in advance.