There are apparently over10,000 apps available in the Mac App Store making it the biggest and fastest growing computer software store online. Independent sources tallied up the app market. Reports from MacGeneration and Macrumors have both reported that the store now offers over 10,000 apps for purchase and download to Mac computers. It is good to see a thriving Mac OS developer community for the desktop and not just for the hugely popular mobile devices.
Sources: Macrumors and Macgeneration via Cnet