Excellent question, I just wrote on a way to do this with the API or by looking at the minimum bid figures.

An AdWords API Rep told us in a Google Groups thread that the minimum bids currently tell us our quality score.

- "Great" keywords have a minimum bid less than or equal to $0.04
- "Okay" keywords have a minimum bid between $0.05 and $0.30
- "Poor" keywords have a minimum bid that is higher than $0.30