Come on! Terry pulling double duty as Locke and Man in black. And he killed playing both. Although I wouldn't be surprised if Nestor won for Ab Aeterno.

Go TOQ!
I agree with Patrick. And man, the guy can act! He played completely different characters and you would still buy they weren't the same person

Honorable mentions:
Michael Emerson - Hm... he is Michael Emerson.
Josh Holloway - it's really interesting to see how he grew up as an actor during these six years. I think in s6 he had a few of his best works. Dock scene in WKD kills me everytime; I love how he is trying to play the though guy, but he is still broken. Also the Sawyer/Juliet reunion in The End; I love his eyes and face there (though EM contributes a lot to the scene. She always makes him a better actor imo)
Jorge Garcia - Jack, Kate and Hurley scene in The Candidate and most of his scenes in The End, really great job, JG ;)

Not a big fan of Nestor or Naveen

i wish for Terry luck.he deserve it.i think

I couldn't really decide between him or Terry. :s Those two dudes bring acting to the next level. Like you guys said, Terry's acting as two polar opposite characters was beyond great. Then of course Michael's acting is always amazing, especially in Dr. Linus this season.
So yeah, if either of those two get it that'll be perfect!

He HAS TO!
Or Terry O'Quinn!

SO tough trying to decide between Michael and Terry. Michael was definitely robbed of his Emmy last year, I'm still annoyed about it, lol. But as much as I'd like him to win this year, Terry has GOT to take the biscuit. PLEASE! give the man an Emmy!! lol

I'd be happy if any of the others won too, though.

Josh is so awesome. And I don't mean him as a guy with a naked torso, I mean that he is really good at acting! And I agree with what Nanda had to say about him. I think he deserves this. But of course ME and TO are absolutely amazing too!

Josh should win!

And Jeff Fahey :)

Or Terry O'Quinn.

Ab Aeterno was just amazing

i`m pretty sure.

Emerson or Terry forsure.

ahah