We've all found ourselves lost on Wikipedia, clicking related article after related article, until you end up on a topic with ties so tenuous to your original entry point, it's hard to figure out how you arrived there in the first place. If this sounds like you, Wikiweb gives you a way to keep track of the links by visualising them in a simple, clear way.
As its name suggests, pages are shown as icons connected together by a web of lines, so it's easy to see at a glance how each article relates to the other and to quickly navigate to a previous article with little effort.
While it's available on iPhone, it looks like the iPad is that way to, going by the screenshots. The web is presented on one side, with the article on the other, so everything's laid out in a less claustrophobic manner on tablets.
There is a bit of bad news -- the app was recently discounted to free a few days ago, so if you want to pick it up you'll have to fork over the full price of $5.49. That said, if you're not in any rush, you could always hang out for another sale and grab it then.