Wapedia is a service that brings the contents of Wikipedia to mobile devices like the iPhone or iPod touch. Although not fully iPhone optimized, search results return the most recent version of every article. The is done by using a combination of a proxy-like behavior and a local article database. This method provides fast speed and up-to-date articles on the one hand, and a low load and low traffic for the Wikipedia servers on the other hand. Wapedia divides long pages into smaller chunks to speed up loading. Images are scaled down. Built in Search engine. You can configure the size of images and other options like the size of the start page. You can thank Florian Amrhein for creating Wapedia. Try with TestiPhone
Wapedia now has an iPhone app version, btw!
http://www.taptu.com/blog/2008/12/01/wapedia-application-released-for-the-iphone/