It would be nice to have an “add to wishlist” button along with the “add to cart” one.
I am preparing to place an order for a custom configuration. I started adding items to the cart on my work computer, only to realize that they live in a local cookie when I came home to continue where I left of. A wishlist would take care of that… and would save the copy/paste trips to Evernote and back.
A wishlist is also good for marketing. People tend to add there items they don’t need along with the ones they do.