The address book in OSX is an example of bad skeumorphism -- it's a fake book with pages that don't actually turn, trying to shoehorn "advanced" computer technology into a visual representation that doesn't work. It's a bad metaphor, a bad analogy. It confuses more than it helps.
The "Notes" application on OSX is a fantastic use of skeumorphism. The legal-pad look shows us at a glance that it's for taking notes, which a plain white background wouldn't do. The analogy between individual note documents and pages is perfect. Anyone can use it instantly, without worrying where documents are saved or anything like that.
The fundamental question is, are design choices helping or hindering understandability and usability? Apps and the web have evolved conventions like share icons and tabs and underlined/colored links, etc. which people understand. Skeumorphism just adds vocabulary from the physical world to the toolbox.
And in the opposite direction of skeumorphism, I think the SVBTLE blog platform itself goes too far to the minimalist. I can't tell people's blogs apart, because they all look virtually identical -- that's bad design. And what the heck is the "kudos nipple"? Why do you hover instead of clicking? A simple thumbs-up icon would be understandable by everyone, which is almost skeumorphic in its own way, since it refers to a physical thumbs-up... Reference to the physical world can be a very useful thing.