I don't have an iPhone, but the fact that I don't carry around a clamshell anymore means I'm definitely improving on the technology front. (Never mind that the clamshell broke.)
Anyway, I'll be looking forward to this app, or some derivative of it, making its way to Android. It's the free Artfinder app, which supplies not only gallery and museum listings, but maps them, saves your favorites, and best of all, uses image-recognition software to match a snapshot of a piece of art and retrieve the work's information for you.
There's also an Art of the Day e-mail blast that sends images of paintings with a quick paragraph on their background. May's selection appears promising: "The Death of Marat" by David, "The Fog Warning" by Homer, "Judith" by Klimt and "Self-Portrait with Thorn Necklace and Hummingbird" by Kahlo (which includes a link to the Los Angeles County Museum of Art's website, where this work is currently on display.)