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As always don't just copy things like this unless you understand them. What might be good for somebody might hurt you. Like WebmasterWorld's robots.txt will take your site out of the wayback machine forever. That could upset some people and make other very happy.
What is a scraper site?
There are a lot of crap websites that present themselves as directories, or search engines, to get Adsense money. From what I've seen, they use the ODP to kick-start things a lot of the time, but however they do it, they consist of no original content, just scraped data and sh*tloads of links out to many sites.
That's my definition, but others here might have a better one, (almost worth a new thread).