There's been a lot written about what it takes to be a great leader or manager, however there is much less available about the poor ones.  Leigh Buchanan, editor-at-large for Inc. magazine (January 2008), offers seven telltale signs that you may not be as good a manager as you think.  Here are her observations:

1. Your employees have developed guidelines for dealing with you and quietly passes this info to new employees.  You know this has occured because employees never suggest improvements to your ideas or indicate there may be other ways to accomplish a given task.  They also act in ways so you don't feel threatened.
2. You have one or two fanatical acolytes.  Whenever the boss is universally loathed, expect the oportunist within the group to assume the role of major "kiss-up."  When your rank and file team members are being walked all over by one or two people, your leadership qualifications are suspect.
3. You never see people walk by your office, desk, or cubicle.  There's a good reason your employees are avoiding you.  You!
4. Your 360-degree evaluations come back short and full of generically positive comments (and maybe a very mild criticism).  The team perceives no value in working with you for improvement.
5. People don't volunteer for your pet projects.  No matter if the idea is good, bad or indifferent, noone wants to work with you.
6. You have legions of former employees, but they rarely ask you to be a reference for them for new jobs.  Your opinion doesn't matter to them--they can get along without you!
7. You have legions of former employees.  Is high turnover the problem, or is it me?  Remember, one issue is nothing special; a repeat of the issue may be suspicious; however, the third repeat usually means it may be more you than them.

You may not recognize yourself here, but your boss might.  People are an organization's most important asset.  If you are not perceived as a good boss, your organization loses because you are allowing a key asset to underperform.  Maybe it's time for you to change.