There have been a few where Krypton never exploded, and Kal-El comes to Earth to live, and he and Lois create a Clark Kent identity, or something similar. Pam Jernigan's Hearts Divided and Hearts United is one that comes to mind, but I know there's a few others.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited