Yay, smilies are back! 
I agree with Tommy about not using () for smilies, <9> sounds the best to me too.
And a code block would be great. Just a simple [code]code goes here[/code] that throws the code in a pre that uses a monospace font (Consolas preferably) and some scrolling (similar to what I use on my blog). Syntax highlighting can come later.
EDIT: On an unrelated note, C9 has been having some performance problems the last few days. Sometimes it's snappy, sometimes it's really slow. Often the Ajax load just sits there and does nothing, and then I have to refresh the entire page to be able to retry the request. For example, I had to type this post twice because it just sat on 'Saving' after clicking edit with nothing happening.