"Las Vegas" (9 p.m., NBC): Here's a TV-watching mission, if you choose to accept it: Try to keep

"Las Vegas" (9 p.m., NBC): Here's a TV-watching mission, if you choose to accept it: Try to keep track of all the weddings we're bombarded with during May sweeps. Looks like tonight's season finale of "Las Vegas" has one brewing as a Montecito staffer prepares to tie the knot.
"Ghost Whisperer" (8 p.m., CBS): Hundreds of ghosts come to Melinda for a free ride in the season finale.
"The Thick Of It" (9 p.m., BBC America): Think you have a rough job? Try being a mouthpiece for the British government in this new comedy import.