I've been experimenting with adding login functionality, and have followed some of the security tutorials such as http://www.asp.net/security/tutorials/creating-the-membership-schema-in-sql-server-cs.
These tutorials walk you have to create a login by creating all the relevant username/password text boxes, and creating a database in which to store the user info.
However, when you create a new web application in VWD 2010, it already has a login functionality provided by using a Login control, which does all of this stuff automatically.
I found the following article: http://msdn.microsoft.com/en-us/library/ms178329.aspx, which details the default login control, and noticed that in the "Storing the login information" section it mentions that once you create a user it stores it in the ASPNETDB.mdf folder.
However, I've added users using the login control, but App_Data folder is empty (in the tutorial which shows you how to add the database manu ...
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