Since last autumn I have been together with a few friends doing a game development project (Makaer [Rudbeck Game Developers]) in school making a multiplayer featured real-time strategy game called Void War programmed in C# using the XNA Framework. (yes I know its not Flash, but anyway) Its quite nice and complete even though we hadn't that much time in the end adding much actual "entertaining" content to the game. But its definitely worth trying out!
And not to forget mention that the homepage we made for the project is quite fancy as well! ;)
Check it out, enjoy! www.makaer.com
//Cander