What: An offline Wikipedia reader for the iPhone. I wanted to write an iPhone app over Christmas, and so hacked this together during the break.

Why: It's the warm fuzzy feeling of having the sum of all human knowledge in your pocket. It's the hitchhiker's guide to the galaxy realised. EDGE is slow; search is slow; you're abroad, in a plane, a tunnel, or on top of a mountain. You have an iPod Touch.

Size: It'll consume about a quarter of your iPhone's storage—the app, indexes and dumps are almost exactly 2GB together.