I've always wondered why Google prevents search engines to index a lot of user-generated content from its properties (photos uploaded to Blogger and Picasa Web Albums, public documents from Google Docs). It's a strange decision from a company whose goal is to make information widely available. For example, no photo uploaded to this blog can be found in Google Image Search or in other image search engines because a robots.txt file disallows that.
Some reasons could be more technical: Picasa Web uses a lot of AJAX and loads images using JavaScript, so search engines can't crawl its pages, but that doesn't mean Google can't come up with a interface that uses less JavaScript.
To solve this problem, a message from Picasa Web Albums announces the integration with Google Image Search:
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