Your inner 12-year-old will thank you for this: Monty Python and the Holy Grail: The Holy Book of Days, an iPad app that takes you behind the scenes of the 28 (!) shooting days of the Python comedy epic via a trove of never-before seen (or heard) outtakes, rehearsals, songs, sound effects, scripts, stills and more. Includes an introduction by John Cleese. ($4.99; click to buy)