You might have seen the various reports around at the moment that Google is playing about on IRC. I just read an interesting post by Dan on his blog which indicates that Googlebot might be getting data from the Toolbar that you may run.
More tests will have to be done, it would be nice to find a list of channels the bot is joining & on what networks. Aside from indexing chat, it's more likely that it's looking for URL's to crawl.
Time will tell.
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