Cara,
Keep in mind that in order to submit a form as a PDF (vs. submitting just the data as XML or the form+data as XDP), the person filling out the form will need Acrobat (not Reader) OR you will have to enable that usage right with Reader Extensions.
Having said that, here are the steps to create a button to email a PDF...
1. Add a button object (NOT the email submit button)
2. On the Object/Field palette, set it to be a Submit button
3. On the Object/Submit palette, set the Submit to URL to be mailto:youremailaddress and the Submit format to be PDF.
Rob Gabbard
Cardinal Solutions Group
www.cardinalsolutions.com