Jay Freeman is about to do for desktop Macs what he's done for iDevices. Freeman, a/k/a Cydia creator Saurik, announced yesterday at 360|MacDev that a jailbreak store for Mac OS X, cycript, and Cydia Substrate is mere weeks away.
Like Cydia, Saurik's vision for the Mac store is a repository, not for apps per se, but extensions of what the OS can't currently do. One such example: Apple's actual Mac Store will not support in-app purchases, a la the iOS world. That alone might make "Mac Cydia" enticing for desktop coders. (If you're one such developer, drop a line to patrick at Cydia for more info…)