The best alternative to monetize your site is to use professional ad serving software and attract your own advertisers.
For example, you can use SmartPPC EVO (smartppcevo.com) software. Advertisers will register on your site to get advertising tools. You can control them via Administrator Control Panel. The main advantage - they will pay you directly.
Additionally, SmartPPC EVO allows abilities to earn from JavaScript-feeds (like Google AdSense, ypn or adbrite) and XML feeds (miva, looksmart, etc).