Probably vinyl records, which is another recent obsession of mine besides ponies. I especially like 7 inch singles. I recently got some money from mom for my birthday, I plan to use it to buy Land of Confusion, One Night in Bangkok and maybe In the Army Now if I'm lucky.
I am still debating whether or not I want to buy a kindle/ebook reader. I like real books but I have too many of them and no space. So it's a growing thought in my mind that at some point I need to consider this.