in honor(?) of the Icelandic volcano, Lonely Planet has made all of their Euro city apps free (usually $7.99) I dont have any big travel scheduled in the near future, but will def download these as I adore LP's guides, and London, Paris, Amsterdam, Vienna, etc are always on the "must get back to" list
http://intransit.blogs.nytimes.com/2010/04/19/travel-deals-free-lonely-planet-app/for direct links