Mars Reconnasaince Orbiter does the orbit insertion burn and arrival at Mars (orbit) tomorrow. NASA TV coverage (Pacific Standard Times) at approximately 3AM, 9AM, 12:30PM [this is the big coverage of the arrival for 2+ hours] and 4:30PM.
Just to add to Bob's post. The orbiter's main engines will begin firing shortly after 4:24 p.m. EST. This is done to slow it down enough for Mar's gravity to pull it into orbit.
