A couple of days ago, Apple launched the Mac App Store, a new way to find, buy, install and update applications for your Mac. It aims to replicate the success of the iPhone and iPad app stores. I believe it will be incredibly successful, breathing new life into the Mac software market by widely increasing the number of users installing (and paying for!) applications on their machine.
The reason is simple: the application purchase and installation process just got a million times easier, which for the first time brings it within reach of many users.