I wish I have that much space for my stamping stuff!
When I read attic, I immediately thought of an article in a recent Martha Stewart Living. She has her craft room in her attic.. She, of course IS Martha Stewart.. but I'm sure you could "steal" some ideas from her craft room in the attic.. I notice she has lots of drawers.. they are really more handy than shelves on walls.. cos you don't even have to get off your chair to get your stuff!
http://www.marthastewart.com/portal/...m&rsc=header_3