It would be incredibly awesome if instead of, or in addition to, bbcodes, we had Markdown support. It allows you to use a nice, logical syntax to get clean, nice code as an output.
Basically, it is just a text formatter. There’s also a php one available here:
http://www.michelf.com/projects/php-markdown/
You can learn about the syntax here:
http://daringfireball.net/projects/markdown/syntax
And try it out here (with an explanation of most of the tags on the right):
http://daringfireball.net/projects/markdown/dingus
I’ve been using it for a long time, and I really love it. We should get it, too. 
