All of CNBC comes out of Englewood Cliffs, NJ. MSNBC operates from two studios at 30 Rock, 3A (the big one) and 3K (smaller one down the hall that's home to Ed and Last Word). Some daytime hours of MSNBC (Chuck Todd, Andrea Mitchell, Hardball) come from DC.
NBC News has two main studios at 30 Rock, 3B (Brian Williams) and 1A, across the plaza (Today). Early Today, or whatever it's called these days, comes out of 3K. I'm pretty sure weekend Nightly News now comes from a very small green-screen studio on the sixth floor. I'm not sure what they're using for "Dateline" these days. It used to come out of 3B before it was renovated for Williams in 2011.
The newsroom for NBC and MSNBC is spread out on the third and fourth floors, and there are offices on upper floors for some of the MSNBC primetime shows. Most of the fifth floor is now filled with edit bays. The second floor (where WNBC radio used to be located) is now broadcast operations, home to NBC network master control and satellite operations. MSNBC's master control is across the river at Englewood Cliffs.
Only two NBC entertainment shows now come from 30 Rock, SNL upstairs in 8H and Jimmy Fallon in 6B. 6A, the former Letterman/Leno studio, is now used by Dr. Oz. ("30 Rock" itself is shot over in Queens at Silvercup Studios, though some exterior scenes are shot outside the real 30 Rock.)
WNBC's local news now comes from 3C, the former Nightly News studio. They also still have a studio on the seventh floor, 7E, adjacent to the newsroom.
Most of NBC Sports now comes from a new facility in Stamford, but Sunday Night Football still originates from New York, upstairs in 8G. The large set on 8G is also used by NBC News for some special events such as election night.