TONIGHT: We've got the season finale of Who Do You Think You Are?, new episodes of Smallville and the Ricky Gervais Show, plus back to back Wife Swaps. Or you could go out with your friends.

8:00 PM

Ghost Whisperer Melinda needs more than a ghost's claim that a nanny is evil and begins an investigation of her own. (CBS)
Smallville Chloe and Tess become trapped inside the Watchtower and Clark learns that Zod's soldiers have superpowers. (CW)
Who Do You Think You Are? In the season finale, Spike Lee travels to Georgia and Texas in search of his roots. (NBC)
Wife Swap A family of Goths who commune with the dead swap with an ultra competitive hockey-loving family. (ABC)

9:00 PM

Medium The murder of her neighbor causes Allison to install a high security system in her house. (CBS)
The Ricky Gervais Show Topics include school curricula and physical altercations. Plus, monkey news about eye surgery. (HBO)
Say Yes to the Dress A bride with a budget of $5000 can't find a dress she likes so her dad doubles the budget, because money buys happiness. (TLC)
Wife Swap Animal lovers swap with fashionistas. (ABC)

10:00 PM

Real Time with Bill Maher Guests include John Bolton, Rep. Anthony Weiner and Chris Matthews. (HBO)
Miami Medical Procter speaks at a hospital fund raiser about the importance of the trauma unit. One person not convinced: me. (CBS)
Private Chefs of Beverly Hills The chefs cook for a family of Orthodox Jews and must get a crash course on kosher cooking. (FOOD)

Who's on the Late Night Couches Tonight?

Jimmy Kimmel Live: Jenna Elfman, Kate Gosselin, Devo (ABC, repeat)
Chelsea Lately Katie Cassidy, Ben Gleib, Jen Kirkman, Josh Wolf (E!, repeat)
The Tonight Show with Jay Leno: Mickey Rourke, Ashley Graham (NBC)
Late Night with Jimmy Fallon: Colin Quinn, Jabbawockeez (NBC)
Last Call with Carson Daly Nick Offerman, Chiddy Bang, Daniel Merriweather (NBC)
Late Show with David Letterman: David Beckham, Mike Birbiglia, the Hold Steady (CBS)
Late Late Show with Craig Ferguson: Lauren Graham, Peter Sagal (CBS)