I think Webmin is the most under rated control on the market today. If you are not running a web hosting company. Their simply is no reason to pay for a paid control panel.
Webmin is free and easy to use. It also gives you full control over your server. From running cron jobs to adding users to the control panel. Webmin does it all! The stock theme for Webmin is rather ugly. The good thing is Webmin allows you to upload new themes via the control panel. The Stress Free Tiger Theme has to be the best looking theme for webmin. You can download it right from the home page
http://www.stress-free.co.nz/content/view/141/2/.
To enhance your Webmin experience even more you would want to install Virtualmin. Virtualmin allows you to setup a new website with the click of a mouse. Just like cPanel! Virtualmin comes in two versions Free and Paid. For most users the Free version is going to be more than enough.
If your not offering web hosting services. You should really look into Webmin and start saving on your hosting fees today. To learn more about Webmin and Virtualmin visit
www.webmin.com