www.hbsp.harvard.edu
Papers and books from the Harvard Business Review - some free and some to order.

www.knowledge.wharton.upenn.edu
Lots of free information from Wharton Business School including articles, analysis of current issues and a newsletter; most down loadable.

www.mckinseyquarterly.com
An online publication with articles and reports covering a wide range of issues.

www.funkybusiness.com
With a name like that, how can you possibly not have a look!