I lost my good key and the one I have the remote doesn't work. For a while it'd lock the doors and open the trunk but wouldn't unlock the doors. Now it does nothing and a new battery doesn't help. Is there something I can try yet or do I just need to get a new one?

Not sure if yours is a MK4 or a MK5, but you can look here for some instructions that may help: http://www.myturbodiesel.com/wiki/key-and-remote-replacement-repair-faq-for-mk5-mk6-vw/