It's interesting to me that people keep saying nothing pays like Adsense. Really? Have you guys tried other networks? Adsense can be the best option for small sites, especially since most networks won't take new sites. But once you're big enough to get invites from some of the established ad networks, I find they pay better in my niches than Adsense. Maybe this isn't true in every niche, but other webmasters I've talked to report the same thing. Adsense is good, but there's better out there, if you can get them to take you.