If a cash registry is your thing but you feel a little odd about it, let me introduce you to Envelope Registry. This online wedding registry allows guests to purchase quirky experiences for you like a swing in a hammock, a cocktail, a ride on a bike or a night in a luxury hotel. Envelope collects the dollars and transfers them to you to spend on your own experiences. They even collect addresses for your thank you cards!
Wedpics sounds like a neat idea.