WP PukiWiki allows the WordPress author to write articles using a light-weight syntax, instead of HTML.
PukiWiki is a PHP-based Wiki. PukiWiki features headings, quotations, lists of various types, preformatted texts, images, footnotes, hyperlinks, smileys, and many others.
WP PukiWiki allow the WordPress author to use PukiWiki-style Wiki syntax in writing posts and pages. The screenshots give you some idea. Visit the main site for more information.