HDTV Listings for March 25, 2011

What we're watching tonight:

• CBS (1080i) has NCAA Tournament Sweet Sixteen action with Marquette/UNC at 7:15 p.m. at Kentucky/Ohio State at 9:45 p.m.
• TBS (1080i) has NCAA Tournament Sweet Sixteen action with Richmond/Kansas at 7:27 p.m. and VCU/Florida State at 9:57 p.m.
• ABC (720p) has the season premiere of Shark Tank at 8 p.m., Primetime at 9 p.m. and 20/20 at 10 p.m.
• Fox (720p) has Fringe at 9 p.m.
• NBC (1080i) has Who Do You Think You Are? at 8 p.m.
• Syfy (1080i) has WWE Smackdown at 8 p.m. and Merlin at 10 p.m.
• IFC (1080i) has the season finale of Onion News Network at 10 p.m.
• HBO (1080i) has The Ricky Gervais Show at 9 p.m., Real Time with Bill Maher at 10 p.m. and Funny or Die Presents at 11:59 p.m.
• BBC America (1080i) has Law & Order: UK at 9 p.m.
• TLC (1080i) has Say Yes to the Dress at 9 p.m. and DC Cupcakes at 10 p.m.
• ESPN2 (720p) has NCAA Women's basketball championship action with Clayton State/Michigan Tech at 8 p.m. and Friday Night Fights at 10 p.m.