Sunscald.

Yep. Rig temporary shade when needed.

Common.

Dan

Thanks guys. I didn't think it was, because it's really not hot where they are. But I'll try and move them where they get shade from the afternoon sun. Another question: will these plants produce more fruit than just this season? Do I keep them around and prune them back? Or should I just let them die and replant again? I've read different reports about how long pepper plants will live in good growing conditions. Some people say a few years. Any thoughts?

Unless you have a special plant or you live in a cold climate with a short growing season, they're best treated as annual plants with new plantings every year.