Jesse from the Pink Cake Box sent me a screen shot of Google testing a different form of Google Sitelinks. Instead of showing Google Sitelinks under a search listing, Google was showing relevant blog posts from her blog.
Here are pictures illustrating this:
(1) This is a typical Google Sitelink for a search on pink cake cookie boxes:
(2) Jesse emailed me this screen shot showing me that Google may have added some relevant blog posts under the search result, as opposed to showing the typical Sitelinks. Also, do note that Jesse is using a “greasemonkey” script that does change the Google search results to add the StumbleUpon features, plus she is logged in, which adds the tags and notes:
This does not appear to be a Google Co-op implementation.