This post may seem a little random, but it makes perfect sense to us since Moishe and I both just finished reading Jews with Swords by Michael Chabon. It's pretty good overall (though a little bit show-y in places). I actually preferred it to Yiddish Policeman's Union and Final Solution in Chabon's recent run of genre works, though I'm pretty sure Moishe would disagree.
In any case, the Khazars are fairly important to the novel (novella? novel-ette?) and so, became fairly important to us to profile. Sometimes it really is as simple as that.