Interesting word association game

Here's a little word association game called Human Brain Cloud. Basically, it throws a word at you and you tell it the first thing that comes to mind. Over time, it will build a network of interconnected words and phrases that you can view. Not sure that it has a real use other than scientific analysis (or a fun way to pass the time), but be forewarned - it can be addictive. As can Google's Image Labeler.