Jan 23rd 2012 7:16PM I don't want guild halls, I want guild airships!
Make it so it doesn't only require massive guild questing and achievements, but also concerted profession effort. Let blacksmiths make the hull using recipes that are unlocked through quests and achievements. Similarly engineers make the engines, alchemists supply fuel and get other things for other professions (wards, interior, all kinds of stuff).
As for functionality, give it an innkeeper, guildbank, portal to faction capitol, guild rep vendors perhaps even guild quests. Oh, and let the it be able to dock at some set locations, near capitols and raids for instance.
Dec 31st 2011 1:50PM Ooh, lovely lovely kittykat
Dec 30th 2011 6:16PM Bring in the bear cavalry!
Dec 29th 2011 10:26AM Gather the Horde!
Dec 28th 2011 4:37PM I love me some turtles!
Dec 28th 2011 10:57AM Please
Dec 26th 2011 4:54PM Disco inferno!
Dec 23rd 2011 9:12AM "Do you have a flag?"
Dec 22nd 2011 4:54PM That's one mighty fine chicken
Dec 22nd 2011 2:31PM It makes me a little gassy, the lovely puffer