This report examines the evolving market opportunity for Enterprise Application Software (ERP) among U.S. small and medium businesses. ERP has evolved in recent years beyond its roots in accounting and inventory management to touch all functions within the enterprise. Spending by US small and mid-market firms on accounting & ERP software and services will grow sustainably between 2008 and 2013. Perspective is provided on ERP and accounting software adoption drivers, as well as guidance on alternative growth paths.