There is another recent thread that was discussing cameras that were suitable for capturing quick movements (pitching, batting). The problem with the ipads and iphones is that they do not capture enough frames per second so even if you do have an app that slows down the movement it will still be blurry.
Here is a screen shot comparing the iPad (Coaches Eye) vs the Kodak Playsport. I just got the playsport Saturday off of CraigsList for $40. The detail is much better... not perfect, but an acceptable low cost alternative.
I'll post this on the other thread too.