The 2008 US News rankings (I know, I know - but they're a point of reference, if nothing else) place them as:
1. Wellesley (4 overall)
2. Vassar (11 overall)
3. Smith (17 overall)
4. Bryn Mawr (24 overall)
5. Mount Holyoke (28 overall)
6. Barnard (30 overall)
USNews.com: America's Best Colleges 2008: Liberal Arts Colleges: Top Schools
Like I said, just one limited point of reference.