Making the Leap From Free to Fee: "Moving from "free" to "fee" is risky. If you offer content that's simply "nice to have" rather than "vital to have," chances are your audience won't pay you a dime. If you have a bunch of competitors offering similar content for free, you're not likely to succeed in charging for what your readers can get elsewhere for nothing. If your audience is ill-defined or if the solutions you offer are only a modest improvement over the status quo, they won't open their wallets, either."

Andy Bourland starts a bi-monthly column in Clickz, the site he co-founded and later sold. Thanks for the link. Just a note though, TEOF is a collablog.