Harvard Business Review – This is a fantastic place to read well written and well researched articles on people management and leadership.
Inc. – For articles on leadership
Entrepreneur – Articles on leadership and management from a, you guessed it, entrepreneurial perspective
LinkedIn – …if you aren’t already there… well, we won’t talk about that. This is the best social network for managers to make connections and build an online reputation (not to mention, the best place to find new job opportunities)
Forbes – More great articles on managing people
Dilbert.com – Okay, you might spend WAY too much time here… but I had to include it
I Will Teach You To Be Rich – Great web site. This is more money management than people management… but financial stress is still stress, and stress impacts your ability to lead.