Indicating on Hover, and also, from the pop up list, being able to click the users name to go their profile would be good too (like PeakD).

Another suggestion, it would be better imo if clicking on the notifications icon could also cause a drop down clickable list to go directly to that event, instead of taking user to a notifications page (again, like PeakD). I find myself often switching between notification page and the event, taking 2 clicks instead of one to get to the next notified event, making it a slower process, and using more bandwidth for both me and the nodes i assume.