Jay Leno is hosting The Tonight Show (10:35 p.m., NBC/Ch. 5) for the last time, and this time it might actually be true. I can't really see him taking the show back again, not with Jimmy Fallon taking over on Feb. 17.
Leno's last guest are Billy Crystal and Garth Brooks. And it will be fascinating to see how he handles his farewell.
Elsewhere on TV ...
The Big Bang Theory (7 p.m., CBS/Ch. 2): Sheldon, Amy, Howard and Bernadette take a trip together.
The Taste (7 p.m., ABC/Ch. 4): The cooks create deserts.
American Idol (7 p.m. Fox/Ch. 13): The Hollywood Round of the competition begins.<