All foundations file a 990 PF form with the IRS.  Page 10 or attachments list funded grants.

The Foundation Center provides a diagram of where to locate selected information on the Form 990 PF at http://fdncenter.org/funders/990pffly.pdf 

GuideStar, a national database of nonprofit organizations,  provides an excellent section on 990’s at http://www.guidestar.org/help/faq_990.jsp

Locate foundation 990 PF forms through these resources:

Foundation Center: 990 PF Search

Foundation Center: Foundation Finder

GuideStar: the National Database of Private Organizations