The com component will quickly tell you how much disk space a folder is taking
Editor: The com component will quickly tell you how much disk space a folder is taking up, this also includes subfolders under the root folder, ideal for web sites that serve document/image content.
Example .asp code included

simple ASP example of usage:-

Set Obj = Server.CreateObject(GetFoldersize.getsize.1)
Dim sz, files, folders
sz = Obj.GetSize(c:inetpub )
files = Obj.files
folders = Obj.folders
NEW:
. changed Trial restrictions to < 50 meg.
2. added more examples in vs,vb & .net you can free download Folder Size COM Component 1.01 now.