It is a good idea. Need to dig through on how difficult to implement this functionality. Because anonymous user browses the wishlist and then purchases item and once the payment is successful, then only we have to tag it as purchased.
I think i will wait this one to be completed before i buy.
For wedding stuff it should be nice to search lists by name or wedding date.
Usually this lists works for, not buy the product, but get the final amount after everybody bought in the store, and buy what he want.