Oh this is a great topic!
Scrapers are the scum of the earth.. They’ve caused me more hassle in the past than I’m prepared to put up with. Two of my best performing pages went the way of the dodo in Google. Totally gone, no reason, bar scumbag scrapers copying my pages. Got one of them removed after hassling their ISP/webhost.
Posted two threads on it on WMW:
http://www.webmasterworld.com/forum30/34154.htm
http://www.webmasterworld.com/forum30/34597.htm (waiting for it to be approved)