The software itself will be a separate application that functions much like the App Store, providing update notifications and a universal installation process. That process, mind you, will be part of the requirements for getting your application into the store, along with Apple's famous content policies -- so we're sure we'll see some irate devs with painful rejection stories. Or maybe not. We know that the company is planning on getting lots of familiar developers into the Store, but we also know that some of what Apple is looking for may not gel with, say... Adobe's installation procedures (or worse). Regardless, right now the number of apps available is small, but you can expect it to grow fast now that every Mac user will get a crack at this software. We're going to be doing a much deeper dive on the experience and report back -- until then, if you're using it, let us know what you think in comments.