ok, this isn't really new, as I'm sure some of you have noticed from your logs googlebot has been doing this for a while now... there's also been a bit of discussion about it elsewhere...
of course, now they've admitted they're crawling search forms and submitting fake queries...
Quote:
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In the past few months we have been exploring some HTML forms to try to discover new web pages and URLs that we otherwise couldn't find and index for users who search on Google. Specifically, when we encounter a <FORM> element on a high-quality site, we might choose to do a small number of queries using the form. For text boxes, our computers automatically choose words from the site that has the form; for select menus, check boxes, and radio buttons on the form, we choose from among the values of the HTML. Having chosen the values for each input, we generate and then try to crawl URLs that correspond to a possible query a user may have made. If we ascertain that the web page resulting from our query is valid, interesting, and includes content not in our index, we may include it in our index much as we would include any other web page.
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source:
Official Google Webmaster Central Blog: Crawling through HTML forms
the above pretty much clearly states how you can manipulate googlebot into crawling specific queries that you want indexed...
have fun
