Some of the turbines manufacturers mentioned by WSJ you have seen here first. For the economy budget, the Skystream 3.7 features improved performance in light winds and can provide 1.8 kw for a starting price of $8500, installed. TH has mention the 1 kW Bergey a couple of times, but WSJ features the Bergey BWC Excel 10kW system, $45,000 to $60,000 installed, but capable of supporting an efficient household and using airfoil technology which is effective in winds as low as 9 mph. At the top end of the range, also providing 10 kW nameplate generating capacity is the ARE442 from Abundant Renewable Energy, costing up to $80,000 installed. For more links and leads, and a pic of a roof-top turbine that's just plain cool, check out the TH piece Wind Turbines on the Edge.
The bottom line: if you have at least half an acre of land, wind speeds of at least 10 mph and an electric bill of at least $60/month, you might be a candidate for your own wind power installation. If you live in California, Massachusetts, New Jersey, New York, Pennsylvania, Ohio or Wisconsin, your payback time will have the advantage of a nice subsidy (up to 50%) off of your investment.
*"Small wind": the market for turbines rated at under 100kW, although the vast majority of home systems are under 10 kW.