Not only does Apple's just launched Mac App Store make finding and installing software programs easier, in some cases it makes them cheaper. Most notable among these are some of Apple's own creations, like the excellent Aperture 3 photo organizer-editor, but third-party software houses are represented as well among deals to be had on the new virtual storefront. And some pretty slick new programs are absolutely free.

Unfortunately, some apps that have moved from the mobile iOS used by iPhones, iPod touches, and iPads, actually cost more in the Mac Store. Nor have we seen any try-before-you-buy options in the App store yet, which is disappointing, given that Aperture has long been available in a free trial download version on the old. But many apps are still available from their makers' sites as trialware—even Apple's own Aperture and iWork programs. As far as returning software for a refund, unless your app doesn't install or work properly, forget about a refund.

Despite those reservations, Mac users are encouraged to perform the update that brings the new Mac App Store. It makes the installation process far more intuitive, lets you install on any of your Macs, and handles updates automatically. And despite the fact that it means app developers will have to hand over 30 percent of their revenue to Apple, some of them are charging less than before anyway. But act fast—many of the deals are time-limited offerings!