You can include HTML-like tags to add in images, change font size or color, underline and highlight text, and more. Also supports Chinese Simplified, Japanese and Korean fonts (must have the appropriate Asian font pack from Adobe installed in order to view). In addition, codepage 1250 (Windows Central European) and 1251 (Windows Cyrillic) may be used when embedding fonts containing those codepages.
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.