First off: Create a feature to send mail/letters to multiple players, just like the patch notes. Preferably a drop list of your friends and/or guildmates and simply check off each player who is to be a recipient, pay the mailing fee and done. This could be a real time saver instead of taking the time to type each individuals name with the same message, over, and over and, over.
And Second: Create a bulletin board for guildhalls for guild officials to post memos, notices, and announcements to members so they can see any changes in the officers or GM's absence. Theses would be erased at the creators leisure.
Opinions, comments, and criticism of all forms are more than welcome
Did you say, "guild bulletin board?"
Mass mailing would be nice, and I'm assuming the standard mailing fee would be multiplied by the number of people you send mail to. It has been brought up before, though...