Hi
You have to do a few things:
1. Make sure you save the PDF as Dynamic, not Static.
2. Make the top level page (and any subforms you embed into it) flowed rather than positioned. You can find this property on teh Object/Subform property sheet.
3. For any large blocks of text, mark the Text Field as "Allow multiple Lines" (on the field tab), and Height/Expand to fit checked (on the Layout tab). Note that the field won't expand till the user tabs out of the field.
Howard
http://www.avoka.com