Meant to do this before now, but have been too busy. Never mind. These are all wonderful fics I've found on Yuletide, that you should definitely read, even if it's not normally your fandom. I have to start with the two (aren't I lucky?) that were written for me, and both left me completely over-excited at their goodness.
Ruffled Feathers by Karrenia. Robin Hood: Prince of Thieves. Centred on Will, which is brilliant because I love him, and his relationship with Robin. It's not slashy, but instead could be entirely canon. How Will comes to accept Robin as a leader.
All These Things That I've Done by Katie. Ocean's 11. How Danny and Rusty met Basher. Perfect, with a con and little touches of humour and dialogue so good it could have been in the movie.
Not written for me, but definitely recommended:
Landed (With Strings) by Mosca. Ice Princess. Very sweet femslash. Just generally lovely. And I think Casey is perfect in it, though it's not from her point of view.
Knowing by H. C. Frost. Mary Renault's Fire From Heaven. Alexander/Hephaistion. I think this is a wonderful take on their relationship, and especially Hephaistion. He's a character that I think is very difficult to write, but I loved him in this.
Poetic Unreason by Ishafel. Pat Barker's Regeneration series. At first I was very doubtful at the idea of Rivers/Sassoon, but this won me over with the quality of the writing the the characterisation. A few sentences in this just hit the 'perfect' button.
Learning by Ara. Sky High, Will/Warren. Warren is perfect in this, exactly as I see him. And it made me laugh, which is never bad.
Coming Up From Behind by hkath. Ocean's 11, Danny/Rusty with Tess as well. A little angsty (especially the end) and so well written.
Out of the Chicago Loop by Jetpack Monkey. More Ocean's 11. Brilliant dialogue, a con, cold Rusty, and a completely sweet ending.