There is a hawk's nest near Alewife station in Cambridge on an office building next to the Fresh Pond Mall. A lot of onlookers have been hanging out everyday with their binoculars and telescopes just watching their day-to-day activities. The two parents are "Buzz" and "Ruby." They have three chicks and they're almost ready to fly for the first time. I've stopped by a couple of times, and it's really fun.
Ernie Sarro has been out there a lot and he has posted some videos on the his CCTV blog.