Is there a web application that you can use for collaborative database design?
Something in the line of SQL Designer, but with the option of collaboration.
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I've used an application called http://www.dabbleboard.com/ - not a bad online app to try. It's not specifically designed for database design but does help in building an ERD.
Not quite sure if this is what you are looking for? http://www.embarcadero.com/products/er-studio-repository