Business 2.0 reports that Apple’s new mini retail stores could be key to boosting Apple’s PC market share, which between January and June was up for the first time in six years (from 2 to 2.2%). The magazine also notes that Apple is testing a new store-within-a-store concept at a dozen of CompUSA’s Good Guys electronics stores in California. “If they take off, they’ll pop up in the other 60 or so Good Guys stores in the West,” the article adds.