From the official description:
With the Museum Guide, you'll get instant access to all the information you need to plot your adventure but dread hassling with, whether you're a visitor or a native, on foot or on mass transit. And with this app, you're not only getting Museum Guide to New York, you'll also be notified as soon as Guides to the museums of other world-class cities are released. Essentially, what you're getting is mobile access to all of the city's Museums, even the obscure ones.
Check it out and then tell your friends!