Forrester Research - A US site with very good research (most is fee based, but some free reports and information in report summaries). Areas covered include: e-business, retail and marketing, media, entertainment, technology, organization and customer service, vertical industries (e.g. health, financial, etc.). Excellent market research if you can afford the full reports.
(URL for this site: http://www.forrester.com/Home/0,3257,1,FF.html)