Big Brother (7 p.m., Ch. 2): The voyeurism continues . . .
Who Wants to Be a Millionaire? (7 p.m., Ch. 4): Regis Philbin hosts.
Teen Choice Awards (7 p.m., Ch. 13): Among those scheduled to appear in these rather goofy awards are Britney Spears, 98 Degrees, Enrique Iglesias, No Doubt and Hanson. (Taped Aug. 6)
Mysterious Ways (7 p.m., Ch. 16): After a six-week introduction on NBC, this so-so series about investigations into strange occurrences moves to its regular home on the Pax network.
Buffy the Vampire Slayer (7 p.m., Ch. 30): Riley helps out when it looks like the Hellmouth may reopen. (Repeat)
60 Minutes II (8 p.m., Ch. 2): An interview with actor John Spencer ("The West Wing").
Dharma & Greg (8 p.m., Ch. 4): Greg starts acting a bit too much like Dharma. (Repeat)
Frasier (8 p.m., Ch. 5): Can strait-laced Frasier throw a properly outrageous bachelor party for Donny? (Repeat)
Angel (8 p.m., Ch. 30): Faith is in town, and she's looking to assassinate Angel. (Repeat)
The Real World (8 p.m., MTV): It's Mardi Gras time in New Orleans.
Just Shoot Me (8:30 p.m., Ch. 5): Finch is attracted to someone who's nothing like his supermodel wife. (Repeat)
Judging Amy (9 p.m., Ch. 2): An old friend of Amy's has found religion. (Repeat)
NYPD Blue (9 p.m., Ch. 4): Diane investigates evidence that Jill's husband may still be alive. (Repeat)
P.O.V. (9 p.m., Ch. 7): "Dreamland" explores the temptations of living in Las Vegas.
Confidential (11 p.m., HBO): This new weekly series starts off strangely enough, investigating various unconfirmed reports regarding rock stars ranging from "Paul is dead" stories about former Beatle McCartney to rumors that Kurt Cobain didn't commit suicide.