Wikipanion is a feature-rich access point Wikipedia on the iPhone. it has an intelligent, well thought out interface. Besides support for multiple languages, Wikipanion has smart search and bookmarking features. you can also e-mail your search results to disbelieving friends.
Wikipanion is also quite accessible. Not only is the font size adjustable, but you can use both multi-touch and double-tap zooming. You can use Wikipanion in either landscape or portrait mode. The only major accessibility feature it lacks is the ability to choose an alternate color scheme. The Wikipanion web site offers detailed descriptions of these features. This intellgent layout is described as Pretty Print:
Wikipanion’s custom formatting for the iPhone formats each page so that it is easy to read and quick to load. With a direct connection to the Wikipedia servers, pages load several times faster than when viewed from Safari. Wikipanion is the only Wikipedia reader to support double tap zooming in and out on the page. It also has complicated algorithms to display tables, size images and scale TeX equations for easier viewing.
The adjustable font slider is describes as Sizes that fit:
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Interactively resize the font size to whatever you please right in the interface. With access to a continuous range of font sizes, you’ll be able to set the point size to exactly what you need. But Wikipanion is even smarter: there’s no need to continually set the font size on each page you read: the last font adjustments are remembered so that you can set it and forget it.