One extremely selfish use: tell me how many hours till Free credits are available
Ooor...a more useless feature: make an item somewhere where anyone can enter a message (ann, status, joke, etc). The item resets randomly during 24 hours so it will be a first come first served based: whoever gets there first after the item resets can add their comm.
Use it as a reminder/player: you have to brush your teeth tomorrow morning between 8 and 9. You have to pay the internet bill - yeah useless and without any connection to MD but I am brainstorming
Make him yell a hall of fame...sort of...Yesterday player X gained the most resources, player Y gained the most stats, player Z had the most battles, player W cast the most spells.
Found another one: the crier yells at you the last login date since there is no possibility (except for using alts) for someone to know when they have last logged in.
Yes, no useful feature but maybe others can get inspired and come up with something good.