So I loved my Treo 650! And after about 4 hours with the 680, there are still some warm fuzzy feelings for the device! I like the feel and size of the keys on the 680. I am having trouble adjusting to the menu key down on the bottom of the keyboard however. Size and Weight? yea, the 680 is a lot sexier! Signal Strength? Its early, but I believe the 650 was a tad bit better. I have a test in my basement bathroom. The 650 is the first mobile phone I ever owned that kept signal in that room! The 680 doesn't! Anyway, if your curious as to what is in the box and a side by side with the 650, you can check it out
here