Kevin did a great job in summarizing a lot of the key things that one needs to do to go fast. Also, Carl was very insightful about the controlled agression comments. Learning to drive the car at/above the limits on a regular basis is critical to taking your skills to a higher level. Different people do this different ways.
Many years ago G.H. Sharp was driving my car and I was riding...he told me that his car control skills were not great, but he was able to catch the car while it was still a "small moment"...thus not allowing it to become a big moment, hence he is always keeping the car right on the edge. While he looks smooth as silk from outside the car he and other great drivers do make many small corrections. While they have different styles, Tim Aro is the same way. In order to improve your "feel" and ability to develop this skill you have to drive the car in an aggressively smart manner. This does not mean driving like you are auditioning for a part in the next Dukes of Hazard remake. Severely overdriving the car results in you trying to catch "big moments." You usually will not have a fast time if you have a big moment, even if you save it.
How do you learn to do this? Hopefully an A+ level driver like G.H. will add his two cents worth. These are my thoughts...
1) Brake early and get off the brakes as early as possible!!! If you overslow for a corner, then the car does not have the energy necessary to allow you to "balance" or steer the car with the throttle. This practice, more than any other, is the difference between being good and learning to be FAST on a regular basis. When I'm not driving as fast as I want it is usually because I hang onto the brakes too long. Making yourself get off the brakes early will force you to develop your skills in this area.
2) Looking ahead not only helps you drive smooth and tie features together, it gives you the visual perspective you need to throw in the proper amount of "correction" when these moments occur. If you are looking 10 feet in front of the car you will likely over or undercorrect and blow your run. This allows you to drive with more aggession. When you look ahead, things appear to happen more slowly. My fastest runs often feel like I was "going to the grocery store"....at a brisk pace of course
3) Turn early & turn less. If you turn-in fast and late you are likely to either pick up a push...or end up spinning the car. This is a time killer! By initiating your turn-in as early as you can to drive the desired arc through the corner it makes it much easier to make corrections in that they will likely be small adjustments. That's another reason Tim and GH are so fast. Tim is amazingly agressive, but he does everything so blooyd early that its easy for him to correct and go on...and he almost never spins a car.
4) Agression. In order to drive aggressively enough often means taking that "leap of faith" at various times by driving into or out of sections at speeds above your comfort level. Driving is a big experiment, so be willing to make calculated moves to test the limits of the car. Just keep braking earlier and less until you blow through a corner...then you've found the limits and can slow it up.
My wife, Chris, is often slow to increase her aggession level and/or is apprehensive about carrrying enough speed through certain sections. We've addressed this by relying on a cute little saying about the car that has worked for her..."throw that bitch in there and hang on."

It works for her. This forces her to get off the brakes and rely on her car control to get through the corner. She has spun on multiple occasions after doing this, but the more she does it the faster she gets and the better her car control has become. After she spins, she goes right back out there and tries it again and usually gets it. The *payoff* for her was at Day #2 at nationals....she had a moment on the last corner of the course on her last run in a fast section....she was able to make a really nice catch at the finish to save a run and have the 2nd fastest time of the day which moved her into the trophies after a really bad Day #1. If you stick with it, you'll build those skills.
After every season, I analyze what I technically need to work on to get faster. Each year I seem to arrive at the same four items. Unfortunately, I am a slow learner so this year is no different, I'll continue to work on the four items mentioned above to help me get ready for next season.