Read this article and thought it was very interesting how Wycoff's list re-iterates several of the threads on futures.io (formerly BMT).
Wycoff's list in no particular order:

1. Failure to have a trading plan in place before a trade is executed.

2. Inadequate trading assets or improper money management.

3. Expectations that are too high, too soon.

4. Failure to use protective stops.

5. Lack of patience and discipline.

6. Trading against the trend - trying to pick tops and bottoms.

7A. Rising losing positions too long
7B. Adding to a losing position.

8. Over trading.

9. Failure to accept complete responsibility for you own actions.

10. Not getting a bigger picture perspective on a market.