Here's the guest actor Emmy nominees up for this year's award:
GUEST ACTOR IN A DRAMA
Michael J. Fox, "Boston Legal," ABC, David E. Kelley Productions in association with 20th Century Fox Television Studios
Christian Clemenson, "Boston Legal," ABC, David E. Kelley Productions in association with 20th Century Fox Television Studios
James Woods, "ER," NBC, Constant c Productions, Amblin Television in association with Warner Bros. Television
Kyle Chandler, "Grey's Anatomy," ABC, Touchstone Television
Henry Ian Cusick, "Lost," ABC, Grass Skirt Productions, LLC in association with Touchstone Television
If I had to guess, I'd say it would go to James Woods. ER has provided quite a few Emmys for guest stars over the past few years including wins for Sally Field and Ray Liotta most recently. From everything I read about it, his work in that nominated episode was pretty spectacular.