Google Discussion search?

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http://ubuntuforums.org – Hi, Does anyone here know what's happened to the "discussions" search option in Google? Its signal-to-noise ratio was superb compared to the regular search. In recent months it started to appear and disappear in the category menu depending on which browser, google.* domain, language and useragent string I had, but now I can't get it with any trick. Even manually adding &tbm=dsc to the search URL does nothing. I'm beside myself. If it's gone for good, do you have any tips to recreate its functionality beyond kludges like "inurl:forum" or "+phpbb"? (Hardware)