4/25/13: Check out the new IMS PharMetrics Plus Database:

We just updated the US IMS LifeLink™ Health Plan Claims Database. Now known as IMS PharMetrics Plus US Health Plan Claims Database, with more than 150 million lives, it offers the ability to link traditionally disparate data sources at the patient level, such as hospital charge master detail, electronic medical records from general practitioner and oncology practices, laboratory detail, over-the-counter medications and consumer demographic and behavioral information.