Sky Defender source code
I am making available the Sky Defender (XNA version) source code. Please read the included info.txt file as it spells out the different licenses involved. Basically the source code you can do with as you please as long as you leave the attributions. The content is various licenses depending on the source, which is listed out in the document.
The source is an integration of Torque X, the Microsft XNA Game State Manager, Nick Gravelyn's Storage Device Management, and Enchanted Age's high score component. I added in multi-threading to the level loading screens and code to handle trials and the buying process. I think there's a few other things in there, but I can't remember them right now.
The Torque X source code is NOT included in this package. It is linked to in the solution file, so you will either need to re-point it to your source copy or reference the compiled dll's instead if you don't have a source license.
And now for the link: http://www.StarlitSkyGames.com/files/games/Sky_Defender_Source.zip