If I wanted to create a scraper page for "waterproof widgets" I would search on this phrase at any of the major search engines and then copy the SERPs page that is the result, post it to a page called www.domain.com/waterproof-widgets.html and then post Adsense on it.

By collecting the scraps from the SERPs I'm likely to get "content" that is highly relevant to the search engines, and the page can very likely rank for the result.

If I wanted to get fancy I could actually go pull more content from each of the links listed, or I could pull the results from all three major engines and then mix them up to get more content, make that content more original, and make it less detectable.

To get even fancier, you can pull the results from the SERPs on a daily basis via automated script so that your pages are updated regularly, giving you even more pull with the search engines.