C# Website system. This is going to be the "Newer" Internet, and even has a custom theme system. This is going to let users do "anything" that won't harm the client computer in any way.
Do you know Dungeon And Dragon, if so you will like to participate in this project to build a small game base upon it, A style of MUD (Multi-user Dungeon) base on the rules of DnD 3.5. Video conference and audio will likely be input to help the game.