I get static electricity shocked everytime I get out of my car-- everytime! How can I stop this?!?

I just bought a 2007 Corolla S and I've never had cloth seats before (and now I know why I shouldn't ever again):: I get a zap of electricity everytime I get out. This happens when I shut the door. I've tried using the rubber soles of my shoe to dampen the shock but even if this works, the next time I touch metal (say, a doorhandle) I get zapped. What can I do to ensure I don't build up static electricity?