ON AND OFF THE AIR:
* CBS checks in ahead of next week's Earth Day observations (April 22) tonight with a youth-oriented, hourlong special in which a variety of show business notables deliver their views on the subject.
"What About Me? I'm Only Three" airs at 9 p.m. on Channel 11, with Ann-Margret as host and guests including Lou Diamond Phillips, Jason Priestley, Loni Anderson, Louis Gossett Jr. and William Shatner, among others.
Media Monitor particularly likes the pithy summary of actor Joe Penny ("Jake and the Fatman"): "If God helps those who help themselves, until recently, he hasn't had much to do."
* Thanks to reader Joan Bechtel of Baltimore for noticing that an item in this space last week inadvertently left out some vital information.
The organization Viewers for Quality Television is mounting a letter campaign to persuade ABC to save the quality Sunday drama, "Life Goes On." As noted here earlier, the series' plot involving Becca (Kellie Martin) and her relationship with an AIDS-stricken young man (Chad Lowe) has been among the best continuing stories on TV this year.
But the advocacy group's address was cut from the bottom of the story. To help save the good show, write: VQT, P.O. Box 195, Fairfax Station, Va. 22039. And here is an address for a network letter, too: Capitol Cities/ABC Inc., 1330 Avenue of the Americas, New York, N.Y. 10019.
ABC has made no announcement whether the show will have a fourth season, but has scheduled a magazine show in the "Life Goes On" 7 p.m. Sunday slot in the fall.
* Another show in danger of disappearing come autumn returns to the ABC schedule with new episodes tonight. "Sibs" stars Marsha Mason, Margaret Colin and Jami Gertz as believable sisters, and is definitely worth a look. Mason is a pro and Colin has long seemed one of the brightest young actresses on the tube, going back to the short-lived "Foley Square.
* There is more than matzah to the holiday of Passover, and an annual Maryland Public Television special, "Passover: Festival of Freedom," explores the eight-day observance, at 11 o'clock tonight. The holiday begins at sundown Friday.
* Almost 160 local dancers ages 18 to 25 will get at least one chance to star on local television as WJZ-Channel 13 soon brings back to the airwaves the dance program "Shakedown."
Recent auditions were held at White Marsh and Owings Mills malls. The show premieres at 11:30 p.m. April 25, and will run at least 11 weeks in that Saturday night slot.
But only about 60 dancers can appear on any one edition, "because that's all we can fit into the studio," says producer Terry Todesco. As the show continues, it is likely producers will choose a fixed group of regulars.
Hosts for the program will be announced soon.