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Personally, I don't like the idea of tying an e-book to a physical object because you end up with... physical objects. Most of which will eventually end up as landfill material. I especially don't like this with SD cards, as it would just create a new market for landfillable plastic-and-metal objects. No one needs that.
I would suggest that a different media could be a better solution, say, a paper card with a magnetic strip that held the e-book (since e-books don't take up much space, this is eminently possible). If the strip could be made to be fully biodegradable, this would eliminate the waste issues involved with plastics and other materials. And paper cards would cost less to manufacture, could be sold like gift cards on end-caps, easily transported and stored.
But having said that, the biggest benefit to digital material is that no physical media is needed. If customers are uncomfortable with ideas like "e-mailing them the link," sell them a Kindle or a Nook. That would be better than unnecessarily tying e-books down with physical media.
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