Can you track who hasn't responded on Adobe Forms Central?

FormsCentral does not provide any way to track that.

You can attempt to track that yourself since you'd have a list of who you sent the form to and could check off users as they respond, but FormsCentral doesn't provide any mechanism to track this.

Thanks,

Josh

You can't check off users as they respond if you don't receive an e-mail when responses are made.  I don't plan to use this product again.

FormsCentral has both Email Receipts (to the form filler), and Email Notifications (to the form author and co-authors) that can be set up to send email on each submission.

There are a number of good FAQs here including one on Email Notifications: Frequently Asked Questions

Thanks,

Josh