WORTH NOTING ON TV

This guide is designed to alert readers to the scope and variety of programming coming up. Listing is not meant to represent blanket endorsement. Viewers are urged to be selective. FRIDAY

Great Performances (PBS, 9-10:30 p.m., check local listings): ``Vladimir Horowitz: the Last Romantic'' - a portrait of the world-renowned octogenarian pianist by filmmakers Albert Maysles and the late David Maysles.

Killer Whale (CBS, 8-9 p.m.): Documentary special explores the surprisingly complex nature of the intelligent, friendly, but ruthless creature.

Disney's Golden Anniversary of ``Snow White and the Seven Dwarfs'' (NBC, 8-9 p.m.): Linda Ronstadt and other stars in a live-action and animated celebration of the 50th anniversary of the legendary animated film.

SATURDAY

Wonderworks (PBS, 8-9 p.m.): ``Colour in the Creek'' - first of two-part story about the Fletcher family in Australia in 1931.

SUNDAY

Indianapolis ``500'' (ABC, 11 a.m.-3:30 p.m. EDT, check local listings): Live coverage of the famous auto race.

The Disney Sunday Movie (ABC, 7-9 p.m.): ``Down the Long Hills'' - family drama about a suspenseful search across the Utah wilderness for two children and a red stallion, survivors of a wagon train massacre.

ABC Sunday Night Movie (9-11 p.m.): ``Celebration Family'' - drama about two young parents who provide a home for an array of unadopted children, and find both joy and tears.

Masked Monkeys (PBS, 8-9 p.m.): A look at the African monkeys called guenons, and the evolutionary puzzle they present.

MONDAY

Bob Hope's High-Flying Birthday Extravaganza (NBC, 8-10 p.m.): Hope and a list of guest stars perform from Pope Air Force Base, N.C.

House of Blue Leaves (PBS, 9-11 p.m., check local listings): Swoosie Kurtz stars in John Guare's Broadway farce about a zookeeper with a flair for writing cheap, imitative popular songs on ``American Playhouse.''

TUESDAY

Frontline (PBS, 9-10 p.m.): ``In Search of the Marcos Millions'' - documentary tries to trace the millions of dollar that Ferdinand and Imelda Marcos are reputed to have taken with them when they fled the Philippines in 1986.

The Presidency and the Constitution (PBS, 10-11 p.m.): ``The Budget Crunch'' - a distinguished panel looks at the federal budget and the separation of powers.

THURSDAY

Moyers: In Search of the Constitution (PBS, 8-9 p.m.): ``Opinions of the Court'': Associate justices Sandra Day O'Connor and Lewis Powell Jr. of the United States Supreme Court.

Listings are in Eastern time; other zones may vary. Please check listings for all PBS programs, since local option often results in different days and times.