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I don't want to sound too harsh, but out of 9,000+ users who can't seem to figure out the "search" function (or how to click on the extensive FAQ) it's getting harder to sift out the actual gems and nuggets of factual, constructive and entertaining posts...
It's the nature of bulletin boards. Haven't seen one yet where topics don't get recycled continuously. And never seen where complaining about it, or urging people to use the search function has much effect.
As for ignore - under a user's profile there's a button to ignore. As for ignoring a thread - well, I assume you can read the title, so don't click on it ...