• Web page addresses and e-mail addresses turn into links automatically.
• Lines and paragraphs break automatically.
• Link to content with [[some text]], where "some text" is the title of existing content or the title of a new piece of content to create. You can also link text to a different title by using [[link to this title|show this text]]. Link to outside URLs with [[http://www.example.com|some text]], or even [[http://www.example.com]].
• You may use <swf file="song.mp3"> to display Flash files inline

More information about formatting options