The British Museum, in conjunction with its exhibit on Pompeii and Herculaneum, has released an iOS App for the iPhone ($2.99) and the iPad ($5.99). The application allows users to explores the cities via interactive maps, view objects in high resolution and contextual detail, an in depth timeline, and the aftermath of the eruption (including the city’s later discovery and excavation). The application draws from archaeological discoveries, the remains at the cite, historical sources (specifically the account of Pliny the Younger).
Right now, the application is limited to iOS devices but an Android version is planned to be released in May 2013.
For more information on the exhibit and its resources, be sure to check out the British Museum’s online exhibition website.