Conan O'Brien debuts as host of "The Tonight Show" tonight, taking over for Jay Leno, who is moving to a prime time slot later this summer.

In addition to his sidekick / announcer, Andy Richter, O'Brien will welcome guests Will Ferrell and Pearl Jam.

If you are online while watching the show, which airs at 10:30 p.m. on channel 4, feel free to join our live blog to let us know what you think.