Textile formatting

 text: _emphasis_
 text: *strong* 
 text: ??citation?? 
 text: -deleted text- 
 text: +inserted text+ 
 text: ^superscript^ 234 ^2^
 text: ~subscript~ CO ~2~ 
 text: @code@ 
 text: "this is a link (optional tooltip)":http://www.microsoft.com

Which renders:

• text: emphasis
• text: strong
• text: citation
• text: deleted text
• text: inserted text
• text: ^superscript 234 ²
• text: _subscript CO ₂
• text: code
• text: this is a link

For more information about Textile, see: http://www.textism.com/tools/textile/index.html