Perhaps the best things about PDF is its portability. This portability makes it an ideal document interchange format, and allows users to establish streamlined, intuitive review processes. With Acrobat 7 Professional, it's even possible to bring users of the free Adobe Reader into the loop to make comments or corrections directly to the PDF file.
In Acrobat Professional:
Select File > Send for Review > Send By Email for Review (Alt + F, V, V).
Click the Browse button to navigate to the desired file.
Once the file has been set, click Next.
Select Customize Review Options.
Check the box next to "Also allow users of Free Adobe Reader 7.0 to participate in this review."
Enter recipient email address(es).
Enter an appropriate email subject and body text.
Click Send Invitation.
Recipients of the PDF document can then use any of Acrobat's commenting tools (Alt + T, C) before sending the PDF back via email. You will then be able to view all submitted comments and can begin the process again for subsequent drafts.
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.