I llike Technorati’s use of HTML tags rather than class names with essentially the same meaning, but I agree it’s a bit verbose to be using all those ems. So I’m mixing ems and strongs in my own tag cloud markup, e.g.:

http://typewriting.org/tag/
http://typewriting.org/link/tag/

Edit: Looks like we lost the tags - Scott shoot me an email and I'll put them back in. Drew.