It should also archive the content of those emails in some sort of private online feed, for easy reference.
I'm going to use it to notify them of new rules and coding conventions we're going to use. Having the conventions also stored in a central place would give me the ability to have new employees just read through that list.
I've seen one before where the whole team submits their tasks and everyone gets a summary email. But I can't remember the name of it. :(