GMail calls them
contextual gadgets:
A Gmail contextual gadget is a gadget that is triggered by clues in Gmail, such as the contents of Subject lines and email messages. For example, Gmail already provides a YouTube contextual gadget. If the body of an email contains a link to a YouTube video, a clickable thumbnail view of the video appears at the bottom of the email.Can I create an application for Yahoo! mail that does something similar?
Thanks -