Conan O'Brien's debut as host of the Tonight Show scored a strong 7.1 overnight rating, which was approximately 154 percent better than Letterman managed to do last night. And as we expected, his success even helped to buoy Jimmy Fallon, whose ratings last night managed to top his debut in early March. That said, it's important to note that Leno's finale on Friday night did an 8.8. [Live Feed/HR]