My favourite palming DVDs are Allan Ackerman's "Advanced Card Control Volume 1", Bob White's "Practical Card Palming" and John Carney's "Carney on Palming". If you want to move on from them with some more advanced stuff, then look into Ed Marlo's "Revolutionary Card Technique", specifically the "Action Palms", "The Side Steal" and "The Tabled Palm" chapters.