Wikipanion
Wikipanion is the best and fastest Wikipedia browsing application for iOS.

Fast

Wikipanion uses a direct connection to the Wikipedia servers, making it extremely fast. Never deal with overloaded third party servers. Never worry about third party server privacy concerns.

Smart

Wikipanion understands the page. Wikipanion pulls out meta material from the page, understanding sections and related foreign language pages.

Convenient

Wikipanion meshes the Wikipedia with your iPhone. Get automatic search results while you type. Set your own font size that is saved and applied to every page with no future adjustment. Your last visited page is opened up from when you last left the application.

International

Wikipanion goes international. Set a primary search language. Switch between different language versions of the page. Quickly retry an existing search in another language. Perform dual search queries in your primary search language and the language of the current page. Wikipanion 1.4's interface is localized in English, German, Italian, Japanese, Norwegian and Russian — but of course supports searching and browsing in 75+ languages!