Never heard of the site. Curious after this introduction I opened the site, went to my chosen hometown of Cologne, DE (1 mil people). Map's empty. Berlin, maybe? Nope. Tel Aviv, IL? Nothing.
So for all the places I care about on this very planet the service doesn't seem to work for me. That's not to slight their service at all, padmapper might be a great service. But either they depended on craigslist too much (and that's why it's barren now for me) or the writer of that blog post should tone down his introduction a bit. Is it planet or US now?