I flipped and flopped on this as I typed it...I'm limiting myself to 5, by the way. Ultimately Daniel Day Lewis won the Oscar and the Golden Globe, but as I mentioned in the previous post, I haven't seen There Will Be Blood yet. (Not to mention it wasn't released in Alaska until well into January of 2008, maybe even February.
George Clooney, Michael Clayton
Emile Hirsch, Into the Wild
Viggo Mortensen, Eastern Promises
Samuel L. Jackson, Black Snake Moan
Joaquin Phoenix, We Own the Night