Control Panels for Web Hosting?

jstrzalko asks: "I recently started a web design and hosting company and am looking at all of the control panel solutions to offer my clients. I consider myself quite adept at Linux so server administration is not the issue. I just want to be able to allow my clients to easily add/remove email addresses and domains, give them stats, manage their databases etc. Has anyone had good experience with any of them? I am currently running Fedora Core3 (test3) on my server, if that helps anyone."