Just stumbled across Worthwhile, a sleek-looking new online magazine "for readers who seek to make a difference while making a living." It's really a group blog by 8 authors who are terrific writers. It reminds me that good blogging is really about good writing. Co-founders are Anita Sharpe and Kevin Salwen, veterans of The Wall Street Journal and winners of a Pulitzer Prize. The other contributors are David Batstone; David Weinberger (co-author of The Cluetrain Manifesto); Halley Suitt (she's an absolute nut; I've met her and I love her. Halley's personal blog is...…