What are the current best solutions for the 30 YC 'ideas'?
JeffJenkins: While I'm probably a bit biased since I work for one of their competitors (shopwiki), I'm not sure if TheFind counts as an answer to 20.  As far as I can tell they don't have any shopping guides, or at the very least not ones which are being made obvious to a user who is trying to find out what they want.  I'm not going to remove them since I have a conflict of interest, but I'm going to add Kaboodle which seems to be doing the most interesting work in the shopping space.