Post-season NCAA basketball will begin today, and continue tonight, on CBS. Other stations prefer to spend some time observing St. Patrick's Day -- although Showtime's prime-time showing of the horror film "Leprechaun" is hardly what you'd call getting in the proper spirit of the holiday.
* NCAA basketball tournament (noon-5 p.m., 8 p.m.-conclusion, WBAL, Channel 11) -- Eight hours of basketball, and this is only the first day of the championship. That's the way the ball bounces. CBS.
* "The Simpsons" (8-8:30 p.m., WBFF, Channel 45) -- Any fresh episode of "The Simpsons" is good news, so here's some good news: Tonight's episode is a first-run show in which, for obvious and nefarious reasons, Homer decides to be a lot more neighborly to his boorish neighbor Flanders. Fox.
* "Seinfeld" (9-9:30 p.m., WMAR, Channel 2) -- More good news: a fresh episode of "Seinfeld." Courteney Cox makes a major step up, after co-starring in "The Trouble With Larry," by graduating to this sitcom, portraying Mrs. Jerry Seinfeld. Nefarious reasons play a part here, too, however, so her union with Jerry is not exactly until death do they part. NBC.
* "Peter Jennings Reporting" (10-11 p.m., WJZ, Channel 13) -- No irony here: Prime-time newsmagazines about murderers get oodles of ink, but Mr. Jennings' breaking-news report on Bosnia gets thrown opposite the NCAA and "Seinfeld" with virtually no promotional support. ABC.
* "Darby O'Gill and the Little People" (7-8:35 p.m., Disney) -- This 1959 Disney fantasy comedy-drama is a really enjoyable movie, made even more fun by vintage performances by Sean Connery and Estelle Winwood.
* "Leprechaun" (8-9:35 p.m., SHO; midnight-1:35 a.m., HBO) -- Lethal leprechaun on the loose -- as plot lines go, don't you think that's a little crazy?
* "Accidental Meeting" (9-11 p.m., USA) -- Linda Purl and Linda Gray star in this distaff rip-off of "Strangers on a Train." Two women meet by chance and agree to kill the problem men in each other's lives. One's kidding, but the other isn't, and murder leads to blackmail, which leads to one dull scene after another. Ms. Purl and Ms. Gray look and act fine, though, so maybe this will get them other, better work.
* "Irish Music and America" (10:05-11:05 p.m., Disney) -- Bono, without the obscenity, is only one reason to watch this fine, well-paced, truly varied hour of music.
* "Real Sex 8" (11 p.m.-midnight, HBO) -- Where will this show go to provide outrageous adult features about sex? To Moscow, where they profile physicists-turned-strippers. To Brazil, where rock singers support the concept of group sex.