I noticed there didn't seem to be Arduino-specific syntax highlighting available for web posts, so I wrote a couple of "brush" files for SyntaxHighlighter. You can see them at work and download them from my blog, here.
I wasn't entirely sure where to post this, so I decided the folder with "Syntax" was probably best; I apologise if that's wrong, and moderators please feel free to move it elsewhere.
Under edit, there is "copy as html" and "copy for forum."
Wow, I'd never noticed those commands before! What a nice feature!
That said, I still prefer the SyntaxHighlighter output: it has many more features and is completely configurable, so it can be made to look however one wants. Hopefully, someone else will find it useful, too.