Here you go, two amazing WHMCS & WordPress Integration plugins:

WHMCS Multisite Provisioning

WHMCS WordPress Integration


It would be good if you could develop a plugin that brings WordPress & WHMCS (www.whmcs.com) together.

I know there is a pro plugin out there that allows you to have user logged into both systems at the same time, but to have WPMUdev do it, with your style and support could be very useful (and also bring in more members).