Why even carry an iPhone if you can't use it to settle petty arguments about things that don't matter?
A mercifully non-literal mobile translation of Wikpedia's interface, Wikipanion gets you to whatever 'pedia article you're looking for a few seconds faster than the regular browser would, and with much kinder navigation once you get there.
Regular version free, Plus version $5
From The App Developers:
Accessing Wikipedia has never been faster and easier than with Wikipanion, designed for easy, search, navigation and display of Wikipedia entries. Streamline your browsing with history grouped by visit date, and bookmarking that not only bookmarks individual entries, but individual sections within an entry.