One of my fellow Microsoft Services consultants from the UK Adam Shepherd, has just had an article published in TechNet Magazine.
The article provides advice on how to scale BDD. This includes how to to support multiple databases, use DFS-R and how to leverage WDS.
The advice is based on learning's from real world so you should find it practical. If nothing else it should help you further understand just how flexible BDD really is.
So go out there and read this article and remember to keep an eye out for future articles from Adam, they will be good!
PS. It is worth having a good look around TechNet Magazine as there are a number of good deployment articles in previous issues.