Serious question:

[jcmoorehead]

Another way that's kinda crazy is to send mail, seriously worded mail, to a developer and pitch something. They might want something serious, like an entire Game Document, if you want them to look through it. Game Docs are essentially the game you're talking about on paper. Gameplay, visual concepts, the fuckin menu, all of that. A good way to practice is to take any game you have and try to word it on paper. This is similar to sending studios screenplays - but I imagine you have a better chance at scoring a game than selling a script.

I would not advise this method, most companies will ignore these types of letters as they generally don't accept user submitted ideas. Best bet is to try to get a job within the industry or to do what Kalyx said and try your hand at creating/coding your own small games to get yourself noticed.

@Kalyx, Coders generally don't get to pitch game ideas it's a designer or team of designers which do that. We just tell the Designers/Artists to fuck off or that what they want can't be done. :P

XNA is something I haven't tried yet properly but would like to, as it stands I'm a C++/DirectX Programmer with limited Unreal2003 Experience.