Don't miss the live "24" chat over at TV Squad; tune in your chat client at 7:00 p.m. EST by finding the chat room info here.
After the jump is our traditional listing of HD programs throughout the night.
Here are some other HDTV programs showing on selected networks today. All times are Eastern and reruns are in italics:
ABC (720p): Desperate Housewives (9 p.m.), Grey's Anatomy (10 p.m.)
CBS (1080i): Cold Case (8 p.m.), Jesse Stone: Night Passage (9 p.m.)
NBC (1080i): West Wing (8 p.m.), Law & Order: Criminal Intent (9 p.m.), Crossing Jordan(10 p.m.)
Fox (720p): NFL Playoffs: Panthers at Bears (4:30 p.m.), 24: Day Five, 7:00 a.m. (8 p.m.), 24: Day Five, 8:00 a.m. (9 p.m.)
UPN (1080i): South Beach (7 & 8 p.m.)
WB (1080i): What I Like About You (6 p.m.), Twins (6:30 p.m.), Supernatural (9 p.m.)
Discovery-HD (1080i): Extreme Engineering (6 p.m.), Sunrise Earth (7 p.m.), Equator (8 & 11 p.m.), Rides (9 p.m.), Risk Takers (10 p.m.)
ESPN-HD (720p): NFL Primetime (10 p.m.), Sportscenter (10:30 p.m.)
HBO-HD (1080i): Starsky & Hutch (7:15 p.m.), The Sopranos (9 p.m.), Deadwood (10 p.m.), Million Dollar Baby(11 p.m.)
HDNet Movies (1080i): Heartbreak Ridge (5:45 p.m.), New Jack City (8 p.m.), North Dallas Forty (9:45 p.m.)
Showtime-HD (1080i): Mermaids (6:30 p.m.), Saved! (8:30 p.m.), The L Word (10 & 11 p.m.)
TNT-HD (1080i):The Matrix (5:30 p.m), The Matrix Reloaded (8 & 10:45 p.m.)