Style themes are also hosted along the library for direct linking. The documentation on usage is available so I won't repeat it here.
I hope this will help the highlighter to spread across blog services such as blogspot.com where people usually have troubles uploading and hosting their custom files. And actually I recommend anyone using selected languages to drop their custom version in favor of the hosted one in order to effectively use browser cache of your visitors.
P.S. I was asked on Twitter why I didn't choose Google. It's simple — I wasn't sure that those guys would care for this library and, I have to confess, initially I didn't find a link on that page where to ask about it. Anyway it was just easier to talk to the guys at my company :-). Thanks!