I love the fact on Elfster you can make a wish list of things from all over the internet and add notes as far as size, quantity, etc. It even has a place to add notes, or add a gift even if it's something you'd buy in person at a store. I would really think adding the feature of viewing a public wish list could be done with just a link and not starting an account would be useful. My father refuses to sign up even thought this allows me to add great details
I have used it in the past for exchanges and it's great, but I'd love to share it as just an in need of wish list that anyone can view if I give them the link. I could be an option just like the public/private option of who can see your wish list. (private, public to those with an account, public to anyone with a link)