This isn't a veg*n website, although I've found lots of recipes that either are or can be modified to be. I love it because you start with the ingredients you have and it searches online sites to find recipes that fit.
For instance, I was interested in making something with peas, potatoes and cauliflower, so I put those three in, and got a list. For each one it tells you what other things you'll need.
http://www.supercook.com/