I've heard some rumblings around here and there. Should women really wear bras?

Here's a link to a tiny article I read on a "how to" but there are no links to anything on any real science.
>http://www.howtodothings.com/fashion-and-personal-care/a4707-how-to-go-braless.html<

I've heard that bras don't actually do any supporting of the breasts, just constraining, and can actually cause more harm than good (even cancer!). But I definitely need to get some research done before I make a choice to go braless. Especially since I'm a bigger girl, my girls are HUGE hah! If anyone has any insight on this, PLEASE share. And I'm not concerned about gender, so if you got real proof saying yay/nay/maybe, I'm all ears!
Thanks!