I bashed out a CKEditor plugin for SyntaxHighlighter. See here: http://ramble.in/ckeditor/syntaxhighlight/
This is a rewrite of the FCKEditor plugin, mostly just scammed the UI so I didn't have to think about anything. The FCKEditor plugin code was too different from CKEditor to port beyond some of the string parsing.
Anyway, hope someone gets some use out of it.
- Enter key does not work in source textarea, need to press Shift+Enter.. Not sure why, I think CKEditor must be capturing the enter key.
Plugin for SyntaxHighlighter