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I site with duplicate content on more that 25(!) different domains, using heavy crosslinking in the noframe area and even deep linking to the various mirror pages at the other domains, as well as keyword repetition and keyword lists, got a PR of 5.
Immediatly I reported these sites, and I hope they will be gone soon. I just could not believe, that a site with that heavy spam techniques was not filtered out in the first place.
Of course I filed a report, but no response or action since a month.
It seems that google don't care about spam any more. I find spam all the time. And it is always cheap, simple tricks.