Xen control panel

If I were to code some sort of simple control panel web site for Xen hosting customers, what sort of features would you like to see on it?

Administrivia

 * Change your email address / postal address / phone number
 * Change your password that is used for the control panel, bandwidth (Cacti), monitoring (Nagios) and machine console

Hosting

 * Change reverse DNS, when I have big enough allocations to allow that (far future)
 * Can still display current DNS and have a form for telling me to do a manual change
 * Restart your domain if for some reason you can't even log in via console - this would be really odd so probably not much of a priority
 * Send a SysRq
 * Set up backup MX / DNS

Informational

 * Report when next payment is due
 * Report bandwidth use for last 30 days on at least a daily basis