Apart from all the elements defined in Creole 1.0, it experimentally supports:

Quotation

start lines with ">" (e-mail style); remarks/comments start with ":"

Address or Signature

See http://www.w3.org/TR/html4/struct/global.html#h-7.5.6 - start a line with two dashes

Superscript

ordinals as 1st, 1ère etc are also automatically superscripted

Subscript

enclose in ",,"

Underlined

enclose in "__"

Hyphen List Markup Proposal

items starting with a number require a space after the hyphen

Footnote

enclose a number in square brackets, then start a line with the same sequence

Email-style emphasis

use a single char ("/", "*", "_") for emphasis

Image inlining

automatic inlining of images when links end with .jpg etc.

It also has a full renderer, to convert documents from other wiki syntaxes to Creole.

Text_Wiki is used by Yawiki, but it can be easily integrated into other php software. For example, it has been used to create a Drupal filter.

Note. Single newlines can be handled as in most wikis (ignored - default) or as in word-processors (meaning a paragraph break).