Powerset offers a very simple search interface when you first hit its main page, and then offers superbly tailored results for the iPhone very quickly. Results pages are a joy to work with - extremely well laid out for finding main articles, offshoot topics, related links and images etc.
According to Powerset, the feature set for on-the-go browsing makes it “...the best way to currently search and read Wikipedia on your iPhone.”
A San Francisco-based company, Powerset was founded in 2005 and is funded by Foundation Capital, Founders Fund, Paperboy Ventures, and a number of angel investors.
Powerset’s first product is a search and discovery experience for Wikipedia, launched in May 2008. Powerset’s technology improves the entire search process. In the search box, you can express yourself in keywords, phrases, or simple questions. On the search results page, Powerset gives more accurate results, often answering questions directly, and aggregates information from across multiple articles. Finally, Powerset’s technology follows you into enhanced Wikipedia articles, giving you a better way to quickly digest and navigate content.