You can do this by editing the template.xml file that your form starts up with by default. You can also do this with code in the OnLoad event, but this is a little more difficult.
Steps to edit template.xml:
1. Select Extract Form Files from the File menu.
2. Follow the wizard to Extract the files to a folder
3. Browse to that folder, and double-click template.xml.
4. Edit the form to include all of the data that you wish to be displayed by default.
5. Save the XML file
6. Right-click manifest.xsf, choose Design, and then save the template to another location to repackage it as an XSN.
Hope this helps!
Matt Faus / Microsoft InfoPath MVPQdabra® Software / Streamline data gathering to turn process into knowledge