I rather like Fazor's idea. If there is an interesting discussion in a thread, but it eventually tapers off and gets buried, it can be hard to dig it up again. Yes, there is a search function, but there are a lot of threads to dig through, even for complicated searches.

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"What do you care what other people think?" -- Richard Feynman
"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." -- Feynman, at the conclusion of his Challenger report