If your software doesn’t automatically recognize trackbacks in sources you link to and you are writing about something from PBS then you may want to look at the source code and add to your manual ping queue. I learned about this via Q&A: PBS Online developers on their site’s Trackback implementation

…While publicizing the trackback URL is an interesting idea, we’ll need to evaluate that idea internally from both an editorial and technical perspective. As we still consider this a test implementation, I expect we’ll keep things pretty quiet, at least for now.

I am planning to go back to the piece I wrote about Terry Schiavo and update at the bottom with a link to a related PBS article which talks about living wills and manually trackback ping them.