If you don't already have one, get a Go-Pro. They're great for film study so you can see where you can improve. On the Cayman, they sit perfectly between the seats on the engine cover ledge. Gives you a great view of the inside and outside of your car.
I'm starting my 3rd season of DEs and I'm certainly not the fastest in my run group, but we just had our 1st 2014 DE and I knocked 3 seconds off the time I ran last fall.
2014-05-04 GPRPCA DE at MAM - YouTube
My "record" lap was the last one in this vid.
Laguna Seca in June. In the words of Bart Scott, "Can't Wait!!!"