Just two short years after announcing its plans for in-car music streaming, Pandora has finally begun to trickle its way into in-dash receivers. The digital music service can now be accessed through four of Sony's latest connected car stereos -- the DSX-S210X, DSX-S310BTX, and the SiriusXM-compatible CDX-GT660UP and CDX-GT565UP. The DSX units connect to Pandora's smartphone app via "an integrated Tune Tray," while the CDX models employ a no-frills USB solution, making
