From their website:
"Hi there! LÖVE is an *awesome* framework you can use to make 2D games in Lua. It's free, open-source, and works on Windows, Mac OS X and Linux."
Lua is easy to pick up, and with this framework, easy to make games with, apparently.
Mari0 (the portal one by Stabyourself) was written using it.
I've written a little (well, ~400 lines of code) snake game using it
Edit: and they have an IRC too! #[email protected].