iTweak looks is a web-based jailbreak app store set to compete with Cydia and will allow you to install applications from the web app directly onto your jailbroken device.

Welcome to iTweak! iTweak is one of the best places to get all of your Tweaks, Themes, Utilities and more on your jailbroken iPhone, iPod touch, and iPad! We serve as an alternative to Cydia, and the Apple App Store.

There is not much known yet, but it looks like you have to login, just like Cydia and we do not know what type of payments will be supported. The developers of iTweak plan on a launch within a month.

For more information check out the iTweak Store.

Source [iMore]