My Favorite Are:
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1. NBC Lets All Be There (1984 - 1985) with Nell Carter.
2. NBC Come On Home (1986 - 1987).
3. Come Home To The Best....Only On NBC (1988 - 1989).
4. Come Home To The Best (NBC) (1989 - 1990).
5. NBC....The Place To Be (1990 - 1991).
6. America Is Watching ABC (1990).
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I think it is a shame that they do not make promos like these anymore.

Def.:

NBC's The Place to Be! 1990-93 Promo
NBC "Let's All Be There!" 1983-84, 1984-85, and 1985-86
NBC's "Come Home to the Best!" 1988-89 and 1989-90
NBC's "Come on Home!" 1986-87.

ABC's Late '70s and mid-80s promos.

NBC definitely knew how to promote their shows back then. Nowadays, it's somewhat lacklustered.