In what way would you want to use the converted document? Acrobat can convert from PDF to a number of different formats.
Related to FormsCentral - a PDF form can be imported into FormsCentral assuming that it contains fillable form fields and is a type of PDF that FormsCentral supports. When a PDF form is imported into FormsCentral it allows you save a "Submit enabled" PDF you can distribute to collect, manage and analyze responses in FormsCentral. When a user fills out the PDF and clicks the Submit button the response data is sent to FormsCentral and is available on the "View Responses" tab.