What are the commonalities between Jewish and Buddhist thought? I've pondered for a while on the possible links between Jewish and Buddhist thought. I have been on Buddhist retreat with people who identify as Jews. Also there is the Buddhist Jew phenomena as exemplified by Leonard Cohen. In addition some of my favorite authors appear to have Jewish background - Sharon Salzberg, Larry Rosenberg, Jack Kornfield etc...

So leading on from this and also inspired by this answer - is it possible to summarise what Buddhist and Jewish thought have in common. I appreciate that this is a big topic but I wonder is it possible to put together the main 3 or 4 points that they might have in common and why there appears to be such a connection between Judaism and Buddhism.
I'm glad to see my previous answer proved inspiring / thought-provoking.

Following up on that:
I'm speaking from the Jewish perspective, specifically the Hasidic perspective. My knowledge of Buddhism is pretty limited, so I will not really be able to give too many points, and I'm sure if you dig into my answers you find specifics that don't line up in the two faiths. I know that there are probably more points where Buddhism and Judaism differ strongly, noticeably when it comes to religious cosmology, attitudes towards deities/G-d, and views on an individual's purpose in life. The same is probably true for almost any two religions -- the specifics are often VERY different.  

However, I do feel that Buddhism and Judaism have these broader themes in common:


The concept of an enlightened individual who serves as an exemplary model: In Judaism we have the Tzadik, akin perhaps to the Bodhisattva. Both are individuals who have attained a special degree of awareness about the reality of existence, which somehow "pulls them out" from the normal frame of reference perceived by normal humans. Both are truly selfless individuals (i.e. individuals devoid of personal ego), who possess the potential to abandon the confines of human existence, and yet who nonetheless persist in engaging in the human world for the sake of others. Both are individuals who attain a clarity of vision which gives them far deeper insight into the cosmic order.   
An emphasis on self-refinement through specific practices: The laws (mitzvot) associated with Jewish observance are akin the Noble Eightfold Path, both of which provide the individual with a means to increase their spiritual refinement and sensitivity. Diverging from these practices is seen in both religions as only deepening our enslavement to the very things we wish to escape.    
A strong emphasis on mental/intellectual cultivation as a means to promote righteous action: Particularly in the Hasidic movement Chabad-Lubavitch, with which I am affiliated, we place huge emphasis on training one's mental faculties to control the emotional faculties. The specifics of this abstract idea are of course complicated, but I find it VERY similar to the concept of Mindfulness, which promotes a rational, objective viewpoint that gives one the clarity to pursue true, meaningful things, while avoiding vain pursuits of personal passions. Mindfulness is a concept which I find so relevant to Jewish observance, that I've gained tremendous personal spiritual inspiration by incorporating it into my own worldview. 


I suspect a large part of the reason why many Jews are involved in Buddhism, and one of the reasons I know I find Buddhism more "approachable" than other religions, is that Buddhism presents an extremely existential, personal, non-judgmental system, and human-oriented approach to spiritually, which does not immediately seem to conflict with Judaism's very concrete, objective presentation of a Deity-oriented reality. 

Quoting Bhante Gunaratana from Mindfulness in Plain English (from which I have admittedly gotten almost all of my knowledge of Buddhism): "[Buddhism's] flavor is intensely clinical, much more akin to what we might call psychology than to what we would usually call religion." I suppose that "flavor" is less of a turn-off than that of another, say Abrahamic religion, all of which have very specific, belief-oriented models of the universe. 

Hope this helps!