Some have mentioned us already but if you consider joining the Monsters you better prepare yourselve for a different experience.
We're not netters nor warriors but we play the game our way: no unprovoked aggression, respect for fellow players including the untaggeds plus we have a rather adult atmosphere. Not to say we do not behave childish *looks at Hawk* but we can have very heated debates about e.g. politics yet still love each other and respect different opinions.
So if you are looking for a unique experience, sign up at
http://www.theappliance.org.
If you're looking for a simple place to net and not be exposed to interesting people with interesting opionions... join one of the other alliances... :)