There are people out there in the world that are absolutely mental for cars. I actually roomed with a couple of them in college. The amount of stuff those guys knew about automobiles bordered on ridiculous. The reason I bring this up is because I know there are people out there who are just as into bicycles as they were into cars. And Cyclepedia is just the app for them.
Hueristic Media has chronicled 100 different bikes throughout history. Some of which have had a profound impact on the way we get around on two wheels and others that... well, that are just plain weird. Each model's image can be rotated a full 360-degrees and zoomed in up to 20 times via finger movements (naturally). The added touch of being able to fold-up the folding bikes via swiping is also pretty cool.
In addition to all the images and descriptions, the app includes well over 300 additional photographs (courtesy of Bernhard Angerer), more than 200 pages of brochures and manuals, and even archival video clips. There's a ton of historical information within these virtual pages. More than enough to make bike fans happy, anyway. And said bike fans can check out Cyclepedia for their iPads right now for $9.99.