I subscribe to Triathlete Magazine, which I really like a lot. I usually buy Oxygen and Her Sports and sometimes Muscle Fitness Hers off the newstand.

I used to subscribe to Bicycling Magazine, but stopped it b/c their content does not seem suited to a serious rider. Hardly any decent training / racing articles, mostly boring human interest pieces or their " bike town" operation.

Triathlete magazine always has good cycling articles, the staff seems to be a little cycling -biased. And good gear reviews and racing and nutrition strategies.