I'm about to open a web service similar to craigslist/gumtree/kijjjiji or whatever it's spelt like. One of the ways we thought of making some money out of this is either ad services like AdSense, premium listings and/or something like Amazon Associates stuff. I've been searching around here and i'm thinking of using a combination of adsense with something else, using OpenX to rotate them. Can anyone give me any advice, details about a small/medium-sized business they own and how much their income is from that and anything you think will help? Cheers.