"The Universal Editing Button (UEB) will allow a web surfer to more quickly recognize when a site may be edited. It will be a convenience to web surfers who are already inclined to contribute, and an invitation to those who have yet to discover the thrill of building a common resource. As this kind of public editing becomes more commonplace, the button may become regarded as a badge of honor. It may serve as an incentive to encourage companies and site developers to add publicly-editable components to their sites, in order to have the UEB displayed for their sites.
In these ways, we hope that this button catalyzes the acceleration of the editable web, and helps accelerate society's trend toward building valued common resources."
I just downloaded the Firefox extension and it seems to work great. Now I am off to edit.
Thanks to Lily Hill of Digital Advocate for pointing this out (via Twitter: @lilyhill) from Marshall Kilpatrick of Read Write Web: Wiki Providers Come Together to Offer Universal Edit Button.