I really enjoy the magic mouse but yeah, the batteries never last. Anything Logitech and bluetooth is a good match.
Look at this too for your MM
http://www.mobeetechnology.com/index.php
It's a rechargeable battery that uses induction. Very cool if you're willing to drop $60 after shipping.
wow great idea , why could apple not come up with that, i did have a similar idea already when the wireless mighty mouse arrived on the market , integrate the induction charger into the foot of the iMac , could be so simple really and all complains about battery life in the magic mouse would be a thing of the past (same would be great for the keyboard too ), as this constant battery changing on Apples wireless keyboard and mouse is annoying