"Kurzweil's defense of "computers commonly embedded in clothing and jewelry" as applying to iPod Nanos embedded in pockets is a bit of a stretch, but in practicality not far at all."

It's very far indeed. You're taking a specific prediction about how we are going to use technology and turning it into a prediction that technology will get smaller and more portable.

It's a technique shared by fabulists, fortune tellers and cold readers:

"I see a brown dog called eric..." "Well, we had a dog but he was a German Shepherd..." "Yes, that's it, I knew I saw a dog!"