It was easier than I expected to find the post; here's the link to the information:
I came across this link for a really cool app advertised in "American Patchwork & Quilting" (Aug. 2011) for your iPad and iPhone. I do have an iTouch but don't think my aging eyes want to use this on such a small screen. However, it may be soooo much fun for so many of you out there. It looks like the price is just under $15. I only viewed one of the videos but found it amazing to see what it can do! Have fun looking
http://quiltersapp.com/blocksPad.html