Beat Sketch looks kinda fun!
Although I don't really care that much for the music component I loved the free-draw demo, and so did the kids I played it with, and I was pretty curious about what kind of 'game' elements it was going to have so it's nice to see this. I like that they scroll the screen. I personally really hope that they improve the drawing bit, and I also wouldn't mind if we got an evolution at some point that uses 1:1 options for this rather than just drawing in x/y, for stuff like 'pressure sensitivity' and such.
Anyway, in Start-the-Party everyone loved the game where you draw in various shapes that end up forming an object that then stars in a short funny animation afterwards, and so a game mode in this that's similar is definitely a good idea. Would be great if you can make custom content for this at some point - though I understand that's in here already to some extent where others draw something and you have to mimic it as best possible. Anyway, I'm going to buy this game when it's out - the demo alone is worth the purchase for me, just as an encouragement.
On another note, I was in mediamarkt today, and while there were separate Move controllers and navcons available, the PS Eye / Move bundle was completely sold out. There were Playstation + Move bundles available though.