I have a very simple vBulletin 3 module that need to be updated to support vBulletin 4. So essentially you would simply install it as one of our customers would do, and fix any problems that appear. This module adds a popup or iframe link that displays our hosted site content. The logged-in username and password and email are added to the URL. This module also supports vbCredits.
I have attached the current version so that you know what is required. All you have to do is make it work on vBulletin 4 .
Just to clarify, the module must flawlessly integrate with all versions of vb4 (vb4.x.x).