I currently own a guild, and I think it would be awesome if there was a message board in the guild hall that the master could post basic guild stuff (guild rules, events, etc). It would also be nice if there was a chat command that allows me to speak with only officers or only recruiters or only members. It would also be cool if we could add interguild relationships, where guilds could compete in contests (like guild wars). These are somethings I think would be excellent additions to an already superb game.