You've probably heard of this magazine, but if not...this is, as far as I know, the only cross specific magazine. I just received issue #4 and it's pretty awesome! It's pretty darn cheap for a year subscription (4 issues) and if the publisher (a racer) gets enough subscriptions, he can put out more issues per year.
Anyway, here is the link http://cxmagazine.com/
BTW- I have no connection with the magazine other than being a subscriber...