Talking about not ugly; it seems that they're using a hex encoded unique identifier for the groups (see movie-talk-bfcd5ecc@breeze123.com in the comparison page.)

I really don't get why people don't look into encoding designed to work well with your eyes more often. There are some pretty good and easy options out there such as ZBase32 (http://en.wikipedia.org/wiki/Base32#Alternative_versions)