* The Bachelor (8 pm/ET ABC)
Romance fans, this is it. Molly? Melissa? Web rumormongers have had their say; now it's Jason's turn. Maybe Ty will have a say, too, after he meets his would-be stepmoms in New Zealand. And where does DeAnna fit into this? She's back, too. After the final rose comes the traditional "After the Final Rose" postgame show, which ABC is promoting breathlessly ("the unexpected and shocking ending of Jason's journey to find true love"). What's more, there's another "After the Final Rose" tomorrow.
* Saving Grace (10 pm/ET TNT)
The crime-riddled character drama's second season swings into action again. (The last new episode was in August.) The series strikes it Ricci: Actress Christina Ricci begins a guest-star arc as Grace's temporary partner, Abby Charles, a uniform policewoman and single mother. Tonight Abby teams up with the hard-living Grace to hunt down an apparent serial killer. Elsewhere, tobacco-spittin' angel Earl spreads his wings, prompting Grace to help the imprisoned Leon just as the prisoner's execution date draws nigh.
* Harlem Heights (10 pm/ET BET)
BET's latest reality series leaves high school and college behind to venture into the real world as it follows eight twentysomethings searching for success and love in the postcollege world. As the name suggests, the cast's home base is in Harlem, a New York neighborhood that's been revitalized over the last two decades. In tonight's premiere, the gang gets together on election night to celebrate Barack Obama's victory.
* Late Show with David Letterman (11:35 pm/ET CBS)
"Meet me in the sound," Bono sings on U2's current single "Get on Your Boots," from the band's latest studio album, No Line on the Horizon, which hits stores tomorrow. And fans can do just that this week on Letterman as Bono and the boys make a guest appearance each night to showcase the CD, their first since 2004's How to Dismantle an Atomic Bomb.
* Late Night with Jimmy Fallon (12:35 am/ET NBC)
Jimmy's jammin': The late-night musical chairs continue with onetime Saturday Night Live player Jimmy Fallon kicking off his new comic talkfest tonight. (He takes the reins from Conan O'Brien, who in turn returns on June 1 as the new host of The Tonight Show.) Tonight's guests feature some heavy hitters: Robert De Niro, Justin Timberlake and music guest Van Morrison, who is slated to draw music from his critically acclaimed 1968 album, Astral Weeks. Slated to appear in Jimmy's inaugural week: Tina Fey (Fallon's former "Weekend Update" partner), Jon Bon Jovi, Cameron Diaz and Drew Barrymore.