New project for RPM-based distros: YUM Web GUI
(ObDisclaimer: I work for these guys.)
Developers at The Prometheus Group recently announced a new open source project on their forums, a web-based interface for YUM that will make it easy to add, remove, and update packages on servers running Redhat-like distributions of Linux. The GUI will be implemented in PHP and Python, and will make use of the RPM modules already present in Fedora Core, Redhat, and like distros. To make it more attractive to sysadmins (who usually have too much to do and too little time to do it all) the web interface is designed to integrate with Plesk, a web-based control panel for Linux machines developed with web hosting providers in mind. Right now, the YUM web GUI is known to function on Redhat Enterprise Linux 4, and CentOS 4 and 5, with other distributions on the way.
At this time the project is actively looking for other developers to contribute to the project, so if you're interested hit the forums and leave a message.