For what it is worth, a few thoughts regarding GAFGuild. Bullet points in Boldface.
1. GAF already has a great forum, a Mumble server, and a real sense of community; if there needs to be an "Official Home" for GAFGuild, it should be GAF. If non-GAF people join the guild for whatever reason, it's just something they'll have to deal with and they will definitely be in the minority. It's not like the game itself doesn't have tools for organization.
2. People are going to want to be in other guilds with friends. Nothing is going to change that. For the people who are in a different 'main' guild, GAFGuild can be a chatroom or a pool of cool people to play with. The fact that you can multi-guild is already giving us a ton of freedom. People should not be forced to make GAFGuild their only guild.
3. Leadership should be spread across multiple individuals if at all possible. It means guild managers are available more often at different times and can offer multiple viewpoints on something so one person doesn't get stuck making decisions. This position should be merit based (if you're helpful, available, knowledgeable and willing, etc.).
3a. Leadership should not be class-based; in the past I've seen guild drama over the "Warrior Class Leader" telling other warriors what to do, act like they're the "Best" warrior, etc. Since there's room for different opinions on builds, strategy, etc., there shouldn't be a single person that people think represents the final word on their class.
3b. Keep the ranks simple; GAF Membership is already a good indicator that someone is not a dick, so everyone should automatically be a "member", then leaders are pulled from that rank. This also helps to prevent people from feeling like they're higher or lower than others.
3c. Anyone with full access to vital guild content (Guild Bank, etc.) should be required to have higher security (authenticators, whatever). Seen too many stories of Guilds getting hacked.
4. We should probably just use GAF's rules regarding behavior; no racism or hate-speak, but adult conversation, profanity and such is fine. This ensures that if you can act like you do on GAF and keep your membership, you should be fine in GAFGuild. I don't want to log in and feel like I can't make a dirty joke because somebody's kid sister is on.
5. I'm in favor of a Zero Tolerance rule on Bitch Drama. There are going to be disagreements, to be sure, but people who start petty shit, hold grudges, sow seeds of discord, etc. are bitches and thus creating Bitch Drama.
Finally, I was stuck running guilds in the past and I really don't enjoy it. I don't think very many people do. I would be okay being an officer or something if needed since I'll probably be on a lot and I follow the game pretty closely, but I don't want to be the guy trying to make sure shit gets organized. I want to log in and play, not log on and have to sort through everyone's problems. Luckily, GW2's approach to content looks like it won't require much management.