AOL's jobs section put together a list of 10 things to avoid at work, particularly in today's high unemployment environment, that can get you fired:

  1. Don't get conveniently sick. -- It won't look good if you repeatedly call in sick on Mondays or take off on vacation during the busiest time of the year.
  2. Don't lie on your job application.
  3. Don't be disgusting. -- Make sure your hygiene is good; body odor will make no-one want to be near you.
  4. Don't stay anonymous. -- Make sure your boss knows about your accomplishments, that you speak up at meetings, that the higher-ups know who you are, etc. Just doing good work and putting in lots of hours isn't enough.
  5. Don't refuse to compromise. -- Be forceful in promoting your ideas, but don't insist on always doing things your way.
  6. Don't be ungrateful. -- Whining about what you think you deserve or complaining to your boss that the work is beneath you won't help you.
  7. Respect the chain of command. -- Don't go over your boss' head except in the most extreme of circumstances.
  8. Don't spend time with the complainers, non-performers and gossips. -- Even if you're not one of them, being associated with these people will reflect badly on you.
  9. Don't refuse to take responsibility when things go wrong.
  10. Don't take credit for other people's work.