This document presents data that describe collections, expenditures, personnel, and services in 65 medical libraries at Association of Research Libraries (ARL) member institutions throughout North America. In 2006-2007, the reporting health sciences libraries held a median of 244,188 volumes, spent a total of $244,188,020, and employed 2,395 FTE staff. Expenditures for library materials and staff made up the largest portion of total expenditures, at 47% and 41% respectively. Respondents reported spending a total of $75,592.753 for electronic materials, or a median of 63% of their total materials budgets. This includes a total of $71,413,063 for ongoing e-resource purchases. List of ARL Member Libraries as of June 1, 2008 is appended. [For "ARL Academic Health Sciences Library Statistics, 2005-06," see ED499290.]