The first thing I noticed about the paperback copy of The Code Book that I picked up recently was that it just felt wonderful: the cover, the inner page paper, everything. This is the most tactilely satisfying book, paperback or otherwise, I've had in very long time. I believe this is independent of the subject matter, which has completely fascinated me since I read "The Gold Bug" at the age of 8 or 9.
In slight contrast, C gave me a (hardback) copy of the latest novel by one of my favorite authors (Rant, Chuck Palahniuk), and while I'm also enjoying the feel of it, I strongly suspect some of that is the enjoyment I'm getting out of reading his prose.
Edit: Ok, so Rant took a a turn for the "Bwah?!" near the end, and while I still enjoyed it, (and it didn't diminish my tactile enjoyment) I feel compelled to say that. Oddly enough, this particular turn is one of which I'd be much more tolerant (and might actually enjoy) coming from another author.