Text format.
[b]bold text[/b]
[i]italics[/i]
[u]underline[/u]
[s]strikethrough[/s]
[url=http://example.com]Example Link[/url]
[quote="username"]quoted text[/quote]
[img]http://example.com/picture.png[/img]
[list] [*]item 1 [*]item 2 [*]item 3[/list]
[size=200%]larger text[/size]
[color=red]Red Text[/color]
[center]Centered Text[/center]
[code]computer code as monospaced text[/code]
[embed]http://youtubed.com/somevideo[/embed] (Embeds a flash or video file into the post)
[p]Starts a new paragraph[/p]