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Klaus Graf points out (by email) that Google has started to mark some gratis OA resources with a right-pointing green triangle.
I've run some tests of my own. It's true. Google doesn't come close to marking all the gratis OA resources, but at least it's marking some. Perhaps the coverage will improve with time. I haven't found any explanation of the new feature at the site.
Here are some sample searches:
Note the first item on the return list for this search:
The green triangle points to a version of an article with a Google address. Is Google also entering the OA archiving business?
Update (9/15/08). Also see Stuart Lewis' comments:
Update (11/21/08). Also see John Willinsky's comments. Excerpt: