I received a letter from Portfolio magazine, announcing that they were ceasing publication. I'm only mildly surprised and mildly disappointed. Surprised only because it joins a list of magazines that I had paid subscriptions to, which folded, or turned into ezines. Red Herring was a favorite of mine, but it disappeared years ago. I became a convert to Business 2.0 . It didn't really get my attention at first, but over time I began to look forward to it. It closed a couple of years ago; I still don't think Time Warner gave it a fair chance. More recently, PC Magazine converted to a net-only product. In all three cases, it was obvious that advertising was down as once-fat magazines full of ads became as thin as a supermodel, but not as rich. I occasionally go to PC Mag online, but for me it just isn't the same. And I'm only mildly disappointed in that I had paid for issues I'll never receive. I'd already decided not to renew my subscription. In an at...