If it's relevant to an existing topic, post in the existing topic. If it deserves a brand new topic, start a brand new topic. But check first. Last week's 10 threads on 'which headphones to buy' will still be relevant this week, if people post in those threads this week, rather than starting 10 new ones.
It works OK. As in, someone will locate the relevant threads quite easily. If it's less frequently asked, it'll likely be harder to find. Someone'll usually be helpful and dig it out. Google is better though (as photojojo pointed out).
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