HBX RSS Test Site
With HBX installed in Firefox, click here: http://broker.parityinc.net/pip/site.html
You will see three buttons: "Best Buy", "Identity Mashup", "Identity Mashup Camp"
Clicking either one will redirect your browser to a HTML test page that contains a form. This form in turn contains an object tag/structure with params. The HBX will automatically submit the form, posting the URL of an RSS-P feed to a target test page (where you can inspect the contents of this URL).