This weekend, the Philadelphia papers published their annual survey of top-rated area employers. Rankings are broken down into large, mid-size, and small companies are results are based on employee responses to questions on a WorkplaceDynamics questionnaire.
The top 3 large companies are all non-profits - KenCrest, SPIN, and Health Partners, Inc, as are 2 of the top 3 mid-size companies, but none of the top 10 small companies (non-profit Treatment Research Institute comes in at #11).
This is an excellent list to mine if you're contemplating a career change or job transition. Getting some insight into how companies treat their employees can help give you some ideas about the values you prioritize when evaluating your employer.