I now have a barebone implementation of SiteBar for IE.  Below are my notes on expansion of its functionalities:

• Authentication – add SAML, Liberty Alliance, and Passport support.
• SOAP – add SOAP (and XML-RPC) support.
• Data Sources – add RSS support and allow websites to list public links, links other sites can legally link to.
• UI – add Outlook like UI for dividing up sections
• Content Rating – P3P and peer-rating.