I just stumbled across the WebP image format yesterday and was very
impressed by the sample images in the gallery and in particular, the
file sizes in comparison to JPEG.
I immediately checked to see if the Gimp (my image editor of choice)
supported WebP, but unfortunately it did not. At that point I decided
to put on my programming hat and write the plugin myself using the
libwebp functions to encode / decode image data. The results of my
efforts can be seen here:
http://registry.gimp.org/node/25366
(Note that I only have the source code for the plugin on the page at
the moment. Binary releases may come later.)
The real reason for posting this is because I thought you might want
to add a link to this plugin on this page:
http://code.google.com/speed/webp/docs/using.html
I noticed that you listed ImageMagick and Photoshop plugins, so I
thought you may want to include a Gimp plugin too now that it's
available.
Thanks for creating such an awesome image format!