The Stars & Stripes Drive In in Lubbock, TX is brand new (well, almost a year old), and is HOPPING. They show 1st run movies, the grill/snack bar is cheap, clean & tasty, and who can beat getting 2 shows for the price of 1? (Wednesday is $10 carload night during the summer).
We love it.
Also, 45 minutes down the road in Lamesa is the Sky-Vue . It's older, but still a great deal when we want to meet the family from Midland for a night out.