Following are some of the links that you may want to look at, time to time. They shall definitely help in keeping one updated, to a certain extent, on the ever changing management/business environment around us. Some of the content at some of the sites is not free.

http://www.thinkingmanagers.com/
http://www.expressexec.wiley.com/
http://www.quickmba.com/strategy/
http://www.berkshirehathaway.com/
http://www.ebsco.com/home/ (Virtual library)
http://www.proquest.com/ (Virtual library)
http://harvardbusinessonline.hbsp.harvard.edu/b02/en/hbr/hbr_home.jhtml
http://www.mckinseyquarterly.com/home.aspx
http://www.intelligententerprise.com/
http://www.strategy-business.com/
http://www.tompeters.com/
http://www.drucker.com/index.html
http://www.batna.com/index.html
http://www.kmmagazine.com/
http://www.businessweek.com/
http://www.oxymorons.info/
http://www.straightdope.com/index.html (They are fighting ignorance since 1973.)