I'm not sure what to say, I haven't checked/updated much in my list of websites in a while, but FA and Livejournal still seem to be the most powerful ways to go. I can't think of any clusters of furry communities larger than FA and LJ except for Second Life, and Second Life isn't connected very well between groups/communities. SL is almost useless for advertising or making sweeping messages.

I had the sudden thought "Large furry community" is an oxymoron, the while the fandom stretches to all corners of the internet, the fandom is rather small compared to the rest of the internet. Our little underground societies are much smaller and more diluted than some of the mainstream ones. Don't give up though! Pick some places and follow it with GUSTO!

Other then live journal and FA, posably Second life in the right place on the right sims.

Also, possibly The Funday Pawpet Show. May be an advertisement on some furry internet radio stations.