IDG:

"The store offers investor research reports, journal articles, reference materials, magazine archives, and other documents. Content is supplied by noted research firms such as Accenture, Gartner, Giga Information Group, Harvard Business Review, IDC, Reuters Business Insight, and Zona Research."

08/15/04 update: the feedback I've got from some publishers sold in this context, as well as tests I ran at MarketingVox last year, suggest this doesn't generate many sales. The main Amazon.com site probably doesn't work too well for B2B customers.