Just to add a little to my comments above - there are still a handful of labels who mail out promo discs, all of them very small specialist labels who know their target market. Otherwise the Sonys of this world send a file download link rather than a promo disc. In the last fortnight Sony have sent me the new Noel Gallagher album (one track might get one play but that's about all) and the latest Dylan CD (which, IMHO is absolutely atrocious. But what do I know?). Every week I'm sent 40 - 80 mp3 downloads but the real surprise is when I get a piece of promotional vinyl. Only two in the last 18 months, though!