I'm in the process of developing a reseller-type control panel. Check it out:

http://secure.compcity.net/billing/admin.php

What I want is just some feedback. It is still in the testing phase at this point, and a few things are still being developed:

The overview button works, however, you can't update the information yet (having a problem with MySQL).

I know that VO is setting up an automated script for resellers. I don't know when it will be ready or anything. However, I do intend to incorporate that into this system when it comes (obviously I'll setup one that doesn't include the VO automated system). I have no idea if I'm going to sell this, keep it in-house, or offer it GPL, we'll wait and see.

Feedback appreciated!