RockYou and Widgetbox have teamed up to offer awidget for Facebook apps. Those applications that have been created with Widgetbox's App Accelerator will display ads sold by RockYou, and participating developers get a 50/50 split with Widgetbox. The App Accelerator is a new release from Widgetbox, which appeals to the non-technical crowd that wants to get in on all this Facebook action. As more companies become distributors of widgets, and offer self-service options for publishers and developers, it's increasingly important for companies like Widgetbox to stay competitive, and this looks like the right way to do so.
Other services that enable Facebook app creations include Clearspring and Splashcast. There's also the Drupal release that's just come out. If you're looking for other ways to make money via Facebook apps, try Lookery, Chitika or 30Boxes options which came out over the summer. If there's any Facebook app that's likely to get you a little bit of pocket change, RockYou may be one of your best bets. The company has maintained top status for Facebook apps since their inception.