I prefer to use subdomains rather than folders. I tested Blog Copier by setting up a subdomain first and then trying to copy the blog but since BC creates a folder it said the folder already existed and (of course) didn't copy. Is there any way I can use subdomains?
Also tested by using BC to copy a blog to a non-existant folder - BC created the folder and copied everything across including all plugs in their activated state with passwords and api intact - nice, very nice. What a time saver! :-) If I can't use subdomains then the folders will do - at a pinch.