Still, Superman can't stand up to Goku. Now, if it was during the Saiyan Saga, Goku might have to use Kaioken x10. Which meant he'd end up dying in the process even if he killed Superman.
Other than that, after the Freiza Saga, the only people Superman could probably beat is Yamcha, Tien, or Krillin. I forgot about that little clown-lookin kid too.
Let's not forget that all of those dbz explosions are just visual metaphors for nukes, and as the series goes on, those nukes get progressively more powerful and more destructive.
Superman is immune to any kind of nuke, explosion, beam, punch, kick, and whatever else you want to throw at him from the dbz Universe. Unless you're made of magic, use magic, know a guy who has some magic, or can convince Superman to destroy himself somehow (even if you could, he'd probably find he's a lot more durable than even he believed), there is no one in dbz who can take Superman.
You guys don't seem to understand the meaning of invulnerability, and I think most of the naysayers have only experienced the God that is Superman through the cartoon series. I actually started reading Superman comics recently (At least once a year, I read a ****load of back issues from various comics) and I'm convinced that there isn't a single entity in dbz who would be able to injure him, let alone beat him. Hell, kryptonite barely affects him nowadays because he's been exposed to the Sun for so long, and that's his one major weakness.