This video is brief, admittedly annoying, but is the first Scientology protest I've seen. These people apparently represent the group "Anonymous" who claimed to have attacked the Church of Scientology's website. The protest was today 2/10/08 in Los Angeles at the largest Scientology center in the city. If anything, it's just interesting to see the beginning of what I'm sure will be more protests to come. And someone apparently forgot their Guy Fawkes mask toward the end (http://img169.imageshack.us/img169/3686/maskzb9.jpg).

Here is the blog where I found the original video, and it also has a short clip of protesters dancing for a security guard.
http://latimesblogs.latimes.com/webscout/2008/02/protesters-asse.html