Some more updates. Mike (mshaver) has suggested to run the forum on the same Drupal server. Also, the main server is running Nginx, which hopefully doesn't conflict with vB (I haven't tried running Nginx). I've noticed in vBulletin.com Support that they have been suggesting Nginx recently, which is a good sign.

I've been working hard on Drupal vB. I'm surprised that it still has a lot of bugs, considering that it's been out for quite some time. Anyway, I've fixed some things and I should be opening up the test environment really soon. I will announce it here and on the Meego-community list soon.

Forgive my slow progress as I am new to Drupal.