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Maybe the scraper site you've discovered got into the rankings through a hidden "bug" in the algorithm.
So I looked at my webmaster tools and found a site with 1,000's of links to us...
That means using things like "fat pings" via PuSH, then delaying the RSS feed until the PuSH ping is received; authorship mark-up; short feeds (that include permalinks) rather than full content feeds, etc.
I don't usually bother reporting just any old scraper, but only if they begin to outrank the original source.
Scrapers getting you down? Tell us about blog scrapers you see: [goo.gl...] We need datapoints for testing.