Hi,
Something I think might be useful - there's guild mail and that's very nice. But most of the time guild members want to post requests (for trades, adventure spots, etc) that would be nice if they could linger until the offer is no longer relevant.
e.g. someone wants to advertise a lootspot. It would be on a guild bulletin board until it is no longer relevant - and then it could be deleted.
It would also be nice for the trade channel.