Apple has announced that over 100 million apps have been downloaded from the Mac App Store in just under a year since the online store opened on 6 January 2011. The company did not break out the difference between free and paid apps, nor was the number of apps (beyond “thousands”) shared. Although inclusion in the Mac App Store is by no means a guarantee of sales success, it has proven to be a boon for many Mac developers. follow link
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.
Mac App Store Passes 100 Million Downloads