Before you do anything else, please back up your Address Book and Google contacts data. Instructions for doing so are in the ReadMe.
OK, got everything backed up? No? We'll wait.
Again, please back up both your Gmail and Address Book contacts before using Spanning Sync v2.0b. You will have to restore from your backup at least once during testing.
Remember, it's a beta, so we expect you to find problems. In fact, we hope you do! Please email all feedback to email@example.com. And thanks again for your help!