Logo: Basically, the promo starts with the ID in the center shot, against a black background with green, blue, and purple rectangles intended to resemble houses, with little "The Best"s scrolling upward, and a comet flying by, with "Only On" over the logo, and the logo zooming in. The promo ends with "Only On" turning into a position viewed from a rightward angle and the logo turns with the text.

Here is a list of IDs I could find at least:

KPRC in Houston, Texas (well, it took four years after hearing an audio-only campaign, but here it is, at last, an ID!!)

WDAF in Kansas City, Missouri

WDIV in Detroit, Michigan

WAVY in Norfolk, Virginia

KARE in Minneapolis, Minnesota

KPNX in Phoenix, Arizona

WICU in Erie, Pennsylvania

WXII in Winston-Salem, North Carolina

WTVG in Toledo, Ohio

WFMJ in Youngstown, Ohio
(WTVG logo is seen at 2:05 in the clip, for the impatient ones :-))
I'm also looking for the KBJR (Duluth, Minnesota) and the KNSD (San Diego, California) version, and the KAMR (Amarillo, Texas) version, and the KXAS (Fort Worth, Texas) version as well)

SFX: The logo zooming in, then, zooming out.

Music: Upbeat synth-calypso music, used in the promo.

Availability: Seen on old tapes.

Scare Factor: None

Note: Just seeking for WNBC's