If you have any care about the Apple and Mac world you'll know that Mac OS X 10.6.6 with the new software app store has been released. I only had a few minutes this morning to play with it, and the only change I could see in the OS was the addition of the app store. The app store itself is very iOS and iTunes like, the only thing I don't know if I like is that when an app is downloaded it's automatically put in your dock, which may or may not be what you want. Course, you also know where the app is and can move it to where you want it from there.
9-5 Mac also noted a huge bonus that you can get apple's Aperture photo editing and management software for only $80. I'm a Lightroom fanboy, but that much of a discount makes me say "maybe it'd be worth it if only to keep from having to try to find ways to get around the 30 day trial limitation!