I've trying to learn ruby at the moment and I need to post code samples on my ruby blog.
So I decided to adapt the excellent SyntaxHighlighter for ruby.
I asked Alex the creator of SyntaxHighlighter if he can add it to the official release...
I can send it to you by mail if you are interested. Drop me a line at email@example.com (I may be slow to respond since I don't check this mail box often)
An example of what it looks like: here