In his attempt to make Cydia faster, richer and truly competitive feature-wise with Apple's own App Store, Jay Freeman, a.k.a. saurik, added a new feature to the alternative store a few hours ago: Theme Center. It was only three days ago that Freeman implemented a new account management system that allows users to easily check on previously installed packages; now, thanks to the new database / index put in place by saurik called "Whole Package Index", users will be able to browse featured themes optimized for Retina and Non-Retina iOS devices.
The selection of themes right now is limited to top-selling Cydia themes and the ones picked by staff of MacCiti and ModMyi. Soon, users will have the option to pick the best themes in Cydia and vote them to have them featured in Theme Center.
We think Cydia keeps getting better on every release and update, and saurik's support is exceptional. Apple should took a few elements from the Cydia Store and port them to the App Store.