For who don’t know what is Cydia, citing wikipedia:
Cydia (pronounced /ˈsɪdi.ə/) is a software application for iOS that is a graphical front end to APT and the dpkg package management system. It allows a user to browse and download applications for a jailbroken iPhone, iPod Touch or iPad. It was developed by Jay Freeman (also known as “saurik”). Cydia was originally released as an open-source alternative to Installer.app on iOS 1.1.x, but quickly became the most popular package manager upon 2.0’s release. A version of Cydia will be released for the Mac OS X as an alternative to Apple’s Mac App Store. Though details on such an application apart from existence are scarce, it is expected to behave similarly to its iOS counterpart. Cydia’s repositories allow the installation of software packages, most of which are available to download at no cost. Cydia also includes the Cydia Store, which offers a number of applications for sale. Software packages are downloaded directly to an iOS device, to the same location as Apple’s pre-installed applications (the /Applications directory). The name “Cydia” is an allusion to the Codling Moth (“Cydia pomonella”), which made famous the “worm in the apple.”
Soon I intend to add the repositories for Maemo.
So what are you waiting for? Try Repo-finder! There is also a search plugin for Firefox.