The final episode of the Sopranos has Vegas oddsmakers going crazy trying to guess which of the surviving characters will ice each other.  Here's how the odds currently stood the Tuesday before the final episode.

Person Killed	Their Murderer	Odds	Explanation
Dr. Melfi	Carmela Soprano	3:1	Carmela wigs out against Tony's numerous indiscretions, killing off the only one of Tony's love interests that he never nailed.
Dr. Melfi	Sigmund Freud's ghost	15:1	Killed by the father of psychology?  Something Oedipal's afoot!
Artie Bucco	Remy, from the upcoming Pixar movie Ratatouille	5:1	A clever bit of cross-promotion by involves a comedic subplot between two beloved comic sidekicks.
A.J. Soprano	A.J. Soprano	1:2	Do it.  You're a worthless character, and it's the only way you could possibly do anything remotely useful in your short, pathetic life.
Carmela Soprano	An explosive bout of diarrhea	10:1	A classy character meets a decidedly unclassy end.
Big Pussy	A severe breakdown in continuity	28:1	The only thing that could possibly kill off Salvatore "Big Pussy" Bonpensiero is if the writers forget that they already killed him off back in Season 2.
Ray Winstone Tony Soprano look-alike	Phil Leotardo	3:1	Last week, Tony's crew assassinated somebody who looked like Phil Leotardo. This week, Phil gets his revenge.
Little Pussy Malanga	Uncle Junior	6:1	Even the fact that he's long dead won't stop Uncle Junior from axing his arch-nemesis one last time.
Tony Sirico's Acting Career	The End of the Sopranos TV Series	1:1	Since it's clearly a good idea to make a new show or movie about mafioso goombahs after the end of the series, he's sure to get LOTS of offers.  Then again, who wouldn't want to see Sirico's "Cyrano de Bergerac?" I'll give really good odds it would involve pointing at people with his index and pinky fingers.
Tony Soprano	Tony O'prano	28:1	The series has never shied away from introducing a previously unknown relative late in the game.  Some speculate that Tony will be murdered by his Irish cousin, Tony O'Prano.
Tony Soprano	Ben Kingsley	15:1	Who better to avenge Christopher Moltisanti's death than one-time cameo Ben Kingsley.  And how notable that vicious murderer Tony Soprano would be finished off by the man who once portrayed Gandhi.
Tony Soprano	Christopher Moltisanti	28:1	Christopher Moltisanti's corpse is resurrected by science, or maybe it's some supernatural shit, and then he pays back the one guy who fucked him over the most. Tying Tony to a cross and setting him on fire, Christopher's revenge truly mixes the sacred and the propane.
Tony Soprano	Patsy Parisi	2:1	Well, actually Paulie Walnuts will do the killing.  But you know mobsters... they always find a Patsy to take the blame.
Everybody	Terrorists	7:2	Let the series go out with a Bada Bang!