From the Smithhsonian Web Site:
The mobile guide to visiting the Smithsonian, built collaboratively with our visitors. Discover what to see and do, search our collections, access podcasts and other apps, and add your tips and photos to Smithsonian Mobile.
Continually refreshed and renewed by both visitors and Smithsonian experts, there’s always a reason to come back to Smithsonian Mobile whether you’re on the Mall, in a Smithsonian museum or beyond!
Direct to Screen Shots and App Download Links
See Also: Compilation of All Smithsonian Mobile Apps and Sites