Wouldn't automatically checking edits against google searches add an awful big load to the servers? Not only is it several thousand hits, but then also thousands more string comparisons? Amd then we'd have event handling for any suspect edits...
On the other hand, making it easier to flag an article is very easy. I love the idea of some links (at the bottom of the pages for example) that allow a casual browser (someone hesitant about clicking "edit this page") to flag an article. I'd propose two, right off the bat: "spam" and "copyright violation" (or maybe call it "plagiarism"). I'd propse just an automated widget to add that as a category to a page ([[Category:Flagged for Spam]] and [[Category:Flagged for Possible Copyright Violations]]). I don't have it completely straight yet, but I'd suppose this would be a dummy form hidden in every page which one submits as an edit.
Of course, that creates a brand new role - some wikidpedians would have to step up to the plate to patrol this...
Best Regards, Aerik