How can I connect my Galaxy 3 to my Mac? How can I connect my Galaxy 3 (running Android 2.1) to my Mac?
I would expect Mac to have no trouble mounting the USB storage when you connect the device over USB, but if it does you coukd try PdaNet.  You can also transfer files over Bluetooth, WiFi, etc; please search for those solutions.  As for syncing, we jeed to know what exactly you're trying to sync.