I like the idea of a list -- maybe it should really be limited to some fixed number -- say 13 to clarify the rationalist stance on superstition :)
Anyway, perhaps this current list is somewhat unbalanced -- for example, before including analytic philosophy, I think the e.g., familiarity with game theory seems much more important.
Also, the first couple of points are like simple rules to follow, while many of the later ones are more about pointing to fields of knowledge than given something short to keep in mind. There's something to be said for both, but it might be clearer to have separate lists for those, e.g., a list of short rules one can remember ("The map is not the area"), and a list of fields that are important, such as parts of economics, game theory, information theory and so on.
An excellent way to improve one's skill as a rationalist is to identify one's strengths and weaknesses, and then expend effort on the things that one can most effectively improve (which are often the areas where one is weakest). This seems especially useful if one is very specific about the parts of rationality, if one describes them in detail.
In order to facilitate improving my own and others' rationality, I am posting this list of 11 core rationalist skills, thanks almost entirely to Anna Salamon.