I just downloaded the Life magazine iPad app. Wow! The basic version is free, but I paid for $1.99 to get the pro version.
You can view all the great Life photographs by location, genre, photographer etcs. Viewing this images and having easy access to them on the road with my iPad is a great time killer and a new source of creative inspiration.
I would love to see more photography books available from the Apple Store for iBooks. The iPad is such a great tool for viewing graphic-laden texts. I'm still using the original iPad as I didn't see much benefit to upgrade within a year of ownership to the iPad2. However, if the iPad3 shows up with a Retina display like my iPhone 4 and 4S, I'm a buyer.