I just ran across this cooler on Engadget and was wondering what other Air owners thought about it as a viable option for heating issues. Since installing coolbook I generally don't have significant heating issues but it's nice to see a relatively compact alternative that opens up the back of the air to ensure proper cooling. It seems a bit expensive and I have no idea what the effects are on the battery life, but I thought I'd at least share the link.
http://www.moshimonde.com/zefyr.html
http://www.moshimonde.com/zefyr.html