No one in the RPG industry does it. The closest to it is Paizo, but you have to be a subscriber of the print product to get the free PDF.
Well, we're doing it with the WotBS print stuff, but that's POD - but that's exactly what we do: a discount code which gives you the PDF version for free at RPGNow. But if we'e only talking about stuff in bookstores, then yeah I guess so.