I would be all for this, as I am curently looking for someone who has done this.
Technical stuff aside, I think it would be awesome to integrate the two systems so that it was set up like this:
The home page of the site should look a lot like vBadvanced:
Have the left column for osCommerce boxes, the middle for products & below them recent posts from select forums (say vendor forums), and finally the right side have forums stats, info, and a list of all recent posts.
So, any updates on this?