i think pandora is the best tool for finding artists in the precise styles you like; i've grown lukewarm on xm/sirius, which like any broad commercial enterprise requires wading through alot of chaff to get to the good stuff. public libraries, at least around here, are also veritable treasure troves of good music and are a no-cost, no-risk way to sample. among publications, i find myself typically agreeing with allmusic and big takeover and disagreeing with pitchfork.