Moonlighting did it back in the 80's. And now Fox's Bones is planning an all black and white episode to air this spring.
“A lot of shows have done those 40’s film noir episodes,” the show's executive producer Stephen Nathan tells me. “But what we’re thinking of doing is going back a few more years to a 1930’s era homage to Depression-Era comedies like (1936's) "My Man Godfrey" (starring William Powell and Carole Lombard) or (1934's) "The Thin Man" (starring Powell and Myrna Loy as Nick and Nora Charles), where they’re living the high life in the midst of the Depression - drinking and having a good time while solving murders.”
What a bizarre concept - Temperance Brennan drinking and having a good time?!
Source: TV Guide Magazine Online
(ETA: If you've heard any rumors recently about David, please read THIS article I wrote on the BCT! Let's stop those rumors in their footsteps!)