Wishlist King is the one I use. I love it. The wishlist it generates is even shareable from a link, so people can give it to others like a gift registry. Cool little app. Not free, but reasonably priced at $4.95 a month.
What would be the difference between wishlist and "cart saver"? I meant it seems like a glorified "cart saver", doesn't it? Assuming one can save multiple carts and each given a name that can shared with friends with a unique URL, wouldn't that be almost the same thing?