http://portal.acm.org/dl.cfm?coll=portal&dl=ACM&CFID=67993640&CFTOKEN=79225119

The Association for Computing Machinery (ACM) provides a digital library of all ACM articles from journals, magazines, and conference proceedings. The articles are provided as full text in PDF format. Access to full-text is by subscription only. As a service to the computing community, the Digital Library offer its search and bibliographic database resources to all visitors, for free. Price per article is $10.