If I could recommend a single business magazine, it would be Harvard Business Review. I'm not biased since I went to MIT. Technology Review is a great magazine, but you won't find the type of business content that you'll find on Harvard Business Review.
I find myself more interested in business these days. This is one of the main reasons why I'm seriously thinking about business school. I just wish I had more time to keep up with my family, my side ventures, and everything else. If I were to add business school to my life right now, something would have to give. So, for now I will read business magazines and listen to business school podcasts during my drive to and from work.