Chrskyk, I think you have a very good shot, though one can rarely be certain-- surely don't let your stats keep you from applying... I mean, it is public health, heh. Here's me in a nutshell:
I went down for what turned out to be a very personal info session in November (loved it), mailed my app in mid December, heard back mid January, but I also know people who submitted and didn't hear back until April.
GRE: 710v (99%), 760q (... I don't remember the %ile), 4.0w (50ish%ile I think)
GPA: 3.39 (3.5 science/math) in Environmental Bio, Chemistry from a "top ranked" liberal arts college in New England
Experience: lots of public health research in the mountains, a bit in Maine, some in Boston; study-abroad in Tanzania; taught kiddos at an ashram in India; some college extracurriculars (nothing spectacular)
Recs: I think they were pretty decent (but who really knows)
Cross-admit: Harvard (ScM), and I was flown out to UW for an interview (MS), but withdrew my app before I heard a decision
Rejection: "Final Round" (whatever that means) rejection from Berkeley (MS)
ASPH lists MPH application admission rates by school. Though it says nothing about the "quality" of the students applying (I can only assume people apply to schools that cater to their clinical/research interests), the ASPH list should help to ease your concerns
.
http://www.asph.org/document.cfm?page=749
2009 Acceptance Rates:
Yale: 39.7% (505/1271)
Emory: 59.3% (1365/2300)
Columbia: 62.3% (1237/1987)
Tufts: no ASPH data
NYU: no ASPH data
USC: no ASPH data
Don't fret it; you'll be fine =).