In amongst my podcasts, iTunes downloaded three “PDFcasts”, two from Make Magazine and one from PilotCast. Of all the ways that people on the Internet have found to re-implement the same basic idea as Usenet, this has got to be the worst. If I wanted content that I had to read on my computer, what’s wrong with a web page? Or better yet, an RSS feed for a web page. Or an email list. Or Usenet.