Usability 
The Taptu folks, who also own Wapedia, the best mobile version of Wikipedia, have apparently mobilized a bunch of other wikis and launched Wikizap, a wiki directory. It features mobile versions of such weird and wacky wikis as the Muppet Wiki, Wookieepedia, the Harry Potter Wiki and NFL, hockey and baseball wiki. And that's just of few of the mobile wikis on Wikizap. There are over 30 wikis in all on the site in English, German, French, Spanish, Italian and Japanese. Source: Oh! Mobile Directory