Hey not sure if this is the right place to tell you this suggestion, but the floating shopping cart on the Monkey Island DVD Preorder page is a bit jumpy when you scroll down. Not a major problem but there's another way you can do this same effect without the jumpiness. Basically instead of calculating the margin top offset, as it seems the current code does, use position:fixed instead.
I learned this from here: http://jqueryfordesigners.com/fixed-floating-elements/
It is a lot smoother. But again not a major thing, just a suggestion! :)
Keep up the good work on the awesome games!