The newest version of Google Earth includes a flight simulator. Though simple in comparison to full-blown simulators, Google Earth's is fun and addictive. To get started, press Ctrl+Alt+A for the initial dialog (on OSX, Command+Option+A). Then choose your plane (F16 or SR22) and initial airport. Joysticks are supported; it has even been reported that force feedback works. The game's controls are sensitive so it takes some getting used to. Here are [2]all the available controls. For a quick overview, check out this YouTube video.
http://www.youtube.com/watch?v=O7z6Yxs69rQ