Messages and comments need a notifier

Project:ProjectPier
Version:0.8.0.3
Component:User interface
Category:feature request
Priority:normal
Assigned:Unassigned
Status:new
Description

When there's new messages and comments, I think they are "drowning" in the Recent activities stream.

What about some kind of a Dashboard-notifier (other than email)? E.g. "There's 1 new message and 2 comments since your last visit." Something like that?