It may seem funny to have a wishlist on a store of this size, but it would be very useful.
I can’t put this book in my shopping cart, since it’s not available yet. (And using shopping carts for things you don’t want to buy now but rather eventually is kludgey anyway.) And I can’t just bookmark it since I’m using someone else’s computer at the moment. (Okay, I could post it to del.icio.us, but I’ve never been satisfied with any browser/del.icio.us integration I’ve tested, so it would just get lost there anyway.) A wish list is really the right solution, and would be very handy.