I remain a complete non-fan of "fingerboarding," or skateboarding on a miniature skateboard with your fingers, but on the other hand (so to speak), I'm a huge fan of physics, especially on a touchscreen, so I'm torn about the release of Touchgrind, which has now made its way into the App Store for $4.99. Playing with a tiny skateboard in real-life seems kind of silly. But playing with a virtual skateboard that responds realistically to your fingers flipping and tapping on a multitouch screen could be really, really awesome -- like a skating game with the best controls ever.
Unfortunately, there's no free demos here -- either you jump in for $5 or you don't. But if you do, there's actually a lot on offer -- 3 game modes, 12 different boards each with their own abilities, and a set of tutorials to get you started. I'm intrigued: I'm not quite sure a mini skateboard will keep my attention for all that long, but it might be worth $5 just to see the physics in action.