Yup, as above, riding the kerbs, and taking quite a bit of an advantage by cutting the corners as much as possible, because the game doesn't punish you as much as it should for running wide, you've just got to be properly aggresive.
While we are on the subject of corner cutting, how come, on the top gear track, the lap can get invalidated by the slightest of "cuts", however at somewhere like Monza and Le Mans you can take SERIOUS liberties with the chicanes.