I just found this great table on the AAMC website which shows the acceptance rates for 2008-2010 based on GPA and MCAT scores.

There is also a further break down of acceptance rate tables based on race and ethnicity, which is pretty interesting.

I think these tables will go a long way to answering the most common question I've seen on the forums here.

For example, I used the information in the top table to answer the question about MCAT and GPA in this thread.