Free Museums for Stranded Passengers in NYC

Everyone's eyes are on Iceland, but if you need a distraction, be stranded in New York. Museums there are offering free admission when you present a plane ticket for April 14-23! Given that NYC museums are really expensive, and then there's the hotel price-gouging, this is a much-appreciated relief! Also, Lonely Planet have made their City Guides for the iPhone free for a few days due to volcano-related extended stays.