But its not updated that fast, so if you're looking for a relatively new thread it won't be tehre. Also, its not that acurrate - if you're looking for "girls afterbanging" you'll come up with lots of threads which contain "girls" and "afterbanging" but not the exact thread. It doesn't show thread titles, either, and it searches news/media/contests and the rest of the site, not just the forums (if you're looking for a thread).
I've complained o-so-many times about the old searchbar, but I can't say the new ones much better.
Hopefully someone takes up the thread tagging idea someone suggested into future consideration, as well as a custom searchbar (not reliant on Google's database)