What we're watching tonight:
- CW (1080i) has Smallville at 8 p.m.
- NBC (1080i0) has the season finale of Who Do You Think You Are? at 8 p.m.
- MyNetworkTV (720p) has WWE Smackdown at 8 p.m.
- HBO (1080i) has the season finale of 24/7: Mayweather/Mosley at 8:30 p.m., The Ricky Gervais Show at 9 p.m., The Life and Times of Tim at 9:30 p.m., Real Time with Bill Maher at 10 p.m. and Funny or Die Presents at 11:59 p.m.
- CBS (1080i) has Miami Medical at 10 p.m.
- Syfy (1080i) airs Stargate Universe at 9 p.m. and Merlin at 10 p.m.
- TLC (1080i) has Say Yes to the Dress at 9 & 9:30 p.m. and Four Weddings at 10 p.m.
- Discovery (1080i) has Construction Intervention at 10 p.m.
- Starz (1080i) has Party Down at 10 p.m. and Gravity at 10:30 p.m.
- Cartoon Network (1080i) has Ben 10 at 8 p.m., Generator Rex at 8:30 p.m., and the season finale of Star Wars: The Clone Wars at 9 p.m.
- Versus (1080i) has Canadiens/Penguins playoffs hockey at 7 p.m.
- ESPN (720p) has NBA Playoffs action with Hawks/Bucks at 7 p.m. and Lakers/Thunder at 9:30 p.m.
- ESPN2 (720p) has NASCAR Nationwide Series @ Richmond at 7:30 p.m. and Nuggets/Jazz basketball at 10 p.m.
- NFL Network (1080i) has Iowa/Orlando Arena League Football at 8 p.m.
- MLB Network (1080i) has Twins/Indians at 7:05 p.m.