I follow a few wedding blogs, and just saw a post about a site called Envelope. Apparently, they have taken the next step past honeymoon registries, and now you ask directly for cash. I think the way it works is that you register for gifts, guests can either give you part of the gift or the full gift, but instead of getting the gift in the mail, you get a check. The site then specifies you can spend the money on anything you would like, so basically you have fake registry items.
The tag line is "Asking for money just got easy" and discusses how awkward it is to ask for money. I actually was thinking the whole site was a joke but it seems legit. Oh, and the people purchasing pay a small fee. It's in Australia only for now it seems. I'm pretty indifferent on honeymoon registries but for some reason this just seems absolutely ridiculous.