All of us music bloggers are pretty close, and we try to look out for each other. Yesterday I was devastated to learn that Alex over iDesignSound had developed G.A.S., so I've staged an intervention. I also try to provide some advice for other musicians who may suffer from this debilitating disorder.
It can happen to any of us. You don't have to suffer alone.
There aren't any videos out yet for the iPad specific Synthesia, but there are hundreds of videos for the PC/Mac version.
HD Piano does a particularly good job of them, making tutorials out of a slowed down version of popular songs. He gives away the first part of most songs on YouTube, but you need to subscribe for the second half. Here is Virtual Insanity, by Jamiroquai.