The Bachelorette 9 p.m., Channel 5
Somehow Jason Mesnick rejected Jillian Harris (above) during "The Bachelor," despite her brilliant theory about how a man reveals his true self in his choice of hot-dog topping. Ketchup? All-American and safe. Sauerkraut? Bad-boy charisma. Tonight, Jillian is the new bachelorette as 25 bachelors arrive by limo and five party-crashers storm the gates.
How I Met Your Mother 8:30 p.m., Channel 4
Of all the season finales this month, this is the one I've been most excited about (next to "Lost"), since we may actually learn more about the mother. "How I Met Your Mother" has managed to create a rich mythology and a sense of mystery, even while it remains your typical punch line-fueled sitcom with a laugh track. The soap operatics on "Friends" always struck me as sweeps stunts, but on "HIMYM" they have an organic quality. Tonight is Ted's 31st birthday, featuring the goat.
24 8 p.m., Channel 25
Jack.
The Kennedys: American Experience 9 p.m., Channel 2
Joe, John.
Medium 10 p.m., Channel 7
Anjelica.
Gossip Girl 8 p.m., Channel 56
Jenny.
Deal or No Deal 8 and 9 p.m., Channel 7
Jerkface.
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