I highly recommend this article, entitled "13 little-known punctuation marks we should be using." Why not? (Well, keyboard-wise it's a little tricky, they're not widely known, etc., etc. But they're still fun. And possibly even useful.)
Additionally, I also recommend a fabulous, classic sketch by Victor Borge called "Phonetic Punctuation." My dad used to give public readings and perform this at talent shows. I loved hearing it. I now question the punctuation of the text Borge used, but I love it all the same.