Although, you know, I'm not quite as jazzed about Canvas Curse as everybody else seems to be. When I first started playing it, I was like, "God damn this is terribly freaking clever." But whenever I'd get to the end of a level I didn't feel any strong urge to play the next level, and generally I'd stop and do something else and then maybe come back to it later.
One thing I'd like to write more about at some point in the future is videogame "affordances" - that's not quite the right word, I'm looking for something meaning the motions you make with the controller translate intuitively into the gamespace. I met a guy at NTI who works for Nokia who is completely devoted to studying this kind of thing...and I forgot his name. Sorry! If you're reading this, give us a shout?
Anyhow, Canvas Curse and Warioware are great examples of this phenomenon. The first example I can think of is Shufflepuck Cafe for the Mac - the motion you made with the mouse was just like the motion of the air hockey thingy on the screen. It was a kind of immersion you don't normally get.
Also, there's this Japanese cooking game - I don't even know what it's called; James Chao has an imported copy in the office - and the various motions you make with the controller (swirling, moving and chopping, and so on) match the various preparation steps for the thing you're cooking. It's really quite fun.
Actually, that's all I had to say on the subject. So I guess I have written about it, now. Still looking for a better word.