There wasn't much of a storyline this time around. However, the writers stuck to the working formula of giving Sheldon the centerstage, and produced another great installment.
I liked the part where Penny gives him a ride to work, and Sheldon annoys her so much, that she kicks him ot of the car. But, my favorite was the part at the DMV, where he comes to get his learners license. Finally, the sequence where he tries his hand on the simulator and refuses to acknowledge that he has given up was hilarious. His theory of evolution to counter the situation was nothing short of exemplary.
A good show, and a great season so far.