Gadgitty is a google wave extension (robot) that lets you put the XML in the blip, and each time you submit the blip, it outputs the gadget XML at a new (non-cached URL), and inserts a gadget with that URL at the bottom of the blip (deleting the gadget that was previously there).

Highlights:

The advantage of this technique is that you can collaboratively edit the gadget.

Install:

To install this wave extension, please add gadgitty@appspot.com to your wave.