Appletell (http://www.appletell.com/apple/comment/appletell-exclusive-mac-app-store-to-open-december-13th/), quoting an “insider source,” says Apple is targeting a Monday, Dec. 13, launch of the Mac App Store.

Craig Federighi, vice president of engineering for OS X, demoed Lion at the Back to the Mac event in October. The Mac App Store brings the Apple App Store experience to Mac OS X, making discovering, installing and updating Mac apps easier than ever, he said. Like on the iPad, you purchase apps using your iTunes account and they download and install in just one step. The Mac App Store will be available for Mac OS X 10.6, and will be built into next year’s Mac OS X Lion.