You know, I wouldn't care WHAT superpower I had, as long as I had one. Even one as useless as making purple sparkles. I mean, how many people can do that? But if I could choose, then I would like...well, anything, really. Teleportation would be good for nature, and it would save a lot of time. Also, I could get into/onto places that I normally wouldn't be able to. Like roofs. Like in the animes. (Seriously, why does the bad guy HAVE to watch the main character defeat one of his henchmen on the ROOF?)
The power to breathe underwater and communicate (well, boss around, really XD) water creatures would be awesome. Like, your arch enemy steals your cookie, and you set a shark on them. =3
Like everyone said, controlling an element would be cool. Fire would be dangerous, though. But you could get rich with lightning. You could, like, charge up the city as a part-time job.
I've always wanted to fly (like everybody else) but now that I think of it, I think super speed, super strength and teleportation is better. I'm kind of afraid of moving heights. Super speed would be awesome. You could go anywhere you want and get past anybody. Like if one day you were cornered by gangsters, you could just zip past them and say, "Screw you, I have super speed." XD With super strength, you would basically be a 'hotshot', and everyone would know not to mess with you. You could even kind of fly, since if you're strong enough, you can jump really high, and you could be really fast if you put a lot of power in your strides.
Basically, if we had super powers, we could find and do our jobs really easily. Unfortunately, we don't. .__.