If I buy the unlimited Forms Central subscription can I assign specific and unique usernames/passwords so that each of my clients can log in and only see thier own forms and no one else's?
You can create FormsCentral forms for clients, but they will need to establish their own accounts to use the forms. This was discussed recently here: http://forums.adobe.com/thread/1151626
To answer your question, you can limit access to the form design and results table to certain individuals. You can assign the roles of co-author, contributor, or reader to individual users. There are a number of sharing options that you can read about in the FormsCentral Help document.
thanks a ton...