AcroDialogs is a Windows-only application that works with Acrobat versions 6 and 7, including the Professional and Standard versions of each. Both the commercial product and a fully functional demonstration version are currently available from the WindJack web site.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.