Some of you may have seen this thing already, but I figure I might as well share it anyways. I've become extremely addicted to this. It isn't a game, just a random flash toy.

Line Flyer is one of the variants with a few extra tools to make life easier.

Here is a list of video examples to show how cool this thing is. Though, I'd recommend you try the toy out first to see how difficult it is, then watch the examples. Really amazing.