AO vs Djoko
AO vs Roddick
USO vs Lopez
TMC vs Ferrer
These are a few of my top picks as well, though I can still find only the highlights of the Djokovic match. A lot of people say his AO SF win over Roddick was more Roddick's fault, but Federer missed almost nothing, even the ridiculous fh cc passing shots that dropped like stones in the back corner.
So it's either that one or TMC vs. Ferrer for me. Against Ferrer, he really pounded the ball from the ground. Ferrer gave a lot of points away, but Federer was cruising, especially in that second set. When he is driving the backhand and forehand down the line, consecutively, you know he's feeling it more than usual.