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Here's an interesting idea: why not have the entire contents of Wikipedia on your iPhone available to you at any time, online or offline? Impossible? Not really.
In fact, Wikipedia is not that huge when you turn it into gigabytes; its entire contents fit into 2.2 GB. Which, given the 16 GB capacity of the new iPhones, is not all that much. Therefore, a developer named Patrick Collison created an application which enables you to access Wikipedia's contents from your iPhone. The application, according to Patrick, is still a bit "rough around the edges," but it works.
The installation process is described in detail in the video below.