Finally get to post to the sub-3.0 acceptance thread!
My undergrad GPA stood at 2.4 from UC Berkeley.
I was just accepted to nearly every school I applied to (I'm still on the waitlist for MIT, but they only took 5 of 25 interviewed students). These were biology/microbiology programs at Berkeley, UCSF, Caltech, UC San Diego, and Wisconsin at Madison. I was outright rejected from Stanford, but was interviewed everywhere else.
I had nearly 6 years of academic research experience after undergrad to try and make up for my GPA, where I worked in a number of labs all over the world, from NASA Ames in California to a remote field camp in Antarctica. It was letters of rec and my current PI that really helped me get through the door. GPA doesn't matter, so long as you have good people going to bat for you. If your GPA is as low as mine was, you definitely need to prove yourself in some way.