Neat app for couponing

Yes, I'm one of the only people around without a smartphone.  I did recently get an iPod Touch, though, and have been having fun checking out apps for it.  I just discovered Key Ring.  It seems like a lot of retailers are moving towards mobile coupons, which I don't have a compatible phone for.  I downloaded Key Ring on my iPod, and I'm able to use mobile coupons on it!  Right now there are some decent Target mobiles on it that I think I'll be using in the near future.  You can also use it to record your store loyalty cards on it as well.  Is anyone else using this app?