I bought Kodu, the same day I got Lights End (also got Monkey Island

)
Its a very powerful game creation tool. It doesn't use code and is all icon driven. Really well laid out and easy to use. Year ago I got quite into DIV Games Studio and Dark Basic. Its a similar kind of thing I can't wait to get stuck into it further. There are loads of tutorials and stuff on there.
The fact its icon driven though means you can't control stuff as much as you can with pure code so it is kinda restricted and apparently you can't make your own textures and stuff.
The whole downloading games other people have made side of things doesn't seem to be up and running yet, despite Kodu being out for a while now :/