Hm... let's see... there's advertisement banners for Arm on topmudsites, and I've just came here by what appears to be a mini-blurb for Arm on Metafilter. Never noticed the Metafilter one before...
Good work, this should swell the ranks quite a bit.
You can also see an advertisement (http://www.armageddon.org/intro/adpage.html) in the Community Resources.
If you have any other ideas about how Arm can advertise feel free to mail them to the mud account (mud@ginka.armageddon.org) and if anyone really wants too you might want to see about getting added to the Publicity section ;)