Might I suggest http://FeaturedUsers.com? It's a Twitter application ad network for users who want to promote their Twitter account. It integrates into your site w/ 1 line of Javascript. Full disclosure, it's my project. :)
I suggest diversifying your ad real estate, at least initially, there's no reason you can't have Featured Users + Adsense + Deck, etc. Just don't go overboard with the # of ads on the screen, you'll drive people away.
You may also try using Google AdManager or OpenX and selling ads yourself. I prefer the former because Google handles the hosting.
> Only a single ad will be shown for each page viewed.
I hear it's a pretty sweet deal, though.