[olalonde]

    The source code is a bit of a mess, but if anyone is 
    interested in the non-bookmarkletized code, I can upload it
    somewhere.

How about hosting the source code on GitHub? I'd love to see how this works!

[shachaf]

OK, I put it up on GitHub. https://github.com/shachaf/jsgif

[icefox]

To be more clear on the gh_pages idea. If you rename your master branch to gh_pages then github will automatically let you browse to it. For example one of my projects which includes a index.html just like yours on github:

https://github.com/icefox/git-achievements

And on icefox.git.com:

http://icefox.github.com/git-achievements/

[shachaf]

Yes, but then the canonical URL would be on github.com.

[icefox]

And the webpage on a gh_pages branch?