I think the two are pretty complimentary. I am aware of several YC companies that have used Angel List to help fill out the round that they raise following YC.

I think the two are pretty complimentary. I am aware of several YC companies that have used Angel List to help fill out the round that they raise following YC. We were in the winter 2010 batch and I can't say enough good things about the people (both the YC team and the YC alumni network) and the program in general.