Downloaded the free PCGS Photograde app from the iTunes store the other day and have been playing with it on my Apple iPad - this is a great application! Using the two-finger expand feature, you can get a crystal clear close-up view of all the coin grade photos. And best of all - it's easy to carry the iPad around with you when visiting a dealer or show...thanks PCGS!
I also have the app on my iPad and love it! I also carry it around when I go to a dealer our show. It's available for the iPhone and iPod Touch, too, for those who are interested.