From http://wiki.slowass.net/?TinyWiki: 
*  Text Formatting

    * Indented texts formatting is preserved.
    * Many text parsing rules are disabled for indented (preformatted) text blocks to allow code to display unmolested.
    * Asterisk starting lines get turned into bullet points.
    * Indented asterisks are second level bullet points.
    * Four dashes on the start of a line creates a horizontal rule.
    * ISBN is munged into a link to Barnes & Nobles. http://www.gnu.org/philosophy/amazon.html - Boycott Amazon.com!
    * Acme::Bleach style module names are munged into links to CPAN.
    * Underscores around text underline it _like this_.
    * Double-slashes around text italicizes it like //this//.
    * Double-vertical-bars around text bolds it like ||this||.
    * UUencoded data pasted into a page is turned into a link to image.cgi. image.cgi extracts it and presents it as an image.
    * Square brackets around text moves it to the end of the page as a footnote and replaces it with a link to the anchor.
    * WikiWords can be qualified to a specific Wiki, eg Wiki:WikiSquatting - see InterMap