So far, the guy who's impressed me most early on is the Louisville center-guard - Eric Wood (not just the numerical drills but his agility in position drills).
TE Jared Cook had sick numbers, but one book on him is that he: "relies on his athleticism rather than technique to get off the line of scrimmage. Tends to freelance a bit as a route-runner. Can make the spectacular catch, but is prone to lapses in concentration. Marginal effort and effectiveness as a blocker, especially in close quarters.
A word of caution - Outstanding athleticism in the drills is no more and no less than just that - the potential of a guy to become an outstanding football player. What the drills can't show you are things like "wilingness and ability to hit", "consistency of execution" and "ability to produce at crunch time."
What the numbers in the drills are useful for - is in confirming what you saw on tape - i.e. that a player who looked fast enough to run with the big dawgs actually was fast enough.
But the danger, in watching the Combine, is making the drills the end-all. For example, Meredith had sick numbers, but the book on him is that he "plays too high." He may run really really fast, but unless he learns to get the pad level lower, he may find himself out of football before long.
Louis Vasquez was the Day One bench press leader, but the question is: "How will that translate onto the field?" (Currently he's rated somewhere around 10th as a guard by some analysts, but is also described as "a tough guy who may start by Year 2" - which makes that bench press number more meaningful within that context.
Bottom Line - The Combine sure am fun.
Rashad Jennings comes in second at the bench with an impressive 29 reps. North Carolina's Brooks Foster leads the receivers with 27, and Kenny Britt put up 23. Percy Harvin was nice with 19 reps.
