Wouldn't be nice to develop similar gadgets for previewing content from other sites, for showing public information about the sender or for performing repetitive tasks directly from Gmail? Google Apps started to offer an API for contextual Gmail gadgets, but it's only available for trusted testers.
"These gadgets can smartly draw information from the web and let users perform relevant actions based on the content of an email message, all without leaving the Gmail inbox."
Google says that these gadgets "can boost employee productivity by complementing email in a context-specific and actionable way", but I'm sure that they're a great way to extend Gmail for all users. For example, a cool gadget for Blogger users could let you moderate comments without opening a new page or reply to comment directly from Gmail.
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