MarketBanker            (http://www.marketbanker.com/mb/sell.php)

MarketBanker allows you the unique possiblity to set the pricing for your site. It also allows you to allow or reject any link that appears on your site (although AdSense itself does a very good job of this as well, with URL filters) There's also a statistics section which will allow you to see how well your site is doing. The ads are small just like AdSense's and they're just as easy to set up. Also, registration for MarketBanker is free.