We own plenty of bicycling books, but this just-released app for the iPad goes way beyond them. Cyclepedia offers exquisite, detailed photographs and write-ups on 100 noteable bicycles from the 1920s to the present day. Anyone with even a passing interest in the history of bicycles and their technology will enjoy this app. Click on a bike, and you have the option to see an interactive, 360-degree view (spin the bike around to see the sides, front, and back), plus detailed, zoom-able photos of various parts. It's quite striking and very well done.
At $9.99, it's among the more expensive iPad apps we've bought, but worth every penny. If you're looking for a gift idea, or if Santa drops an iTunes gift card in your stocking, this is a must-have item.
Screenshot from the app (yes, there's plenty more Campagnolo stuff):