The Ten Biggest Mistakes a Poker Player Makes

[melioris]

wow, great thread and comments.

If this is for live play, I add not being aware of your body, or self-aware, or however you want to say it. One should be aware of not just how they appear to other (which is really important), but also one's posture, body language, etc.

I am not suggesting acting, just aware of the nature body language you are communicating.

For online, I add playing too many tables. Finding the number of tables that maximizes your $/hr rate. Also, and along these lines, with online I think a mistake that good players make is not spending enough time analyzing your game with all the software that is unavailable to do this. For both NL and L pokertracker is not just to use against your opponents, it is to use for you to improve your game.