diberry - 4:51 am on Sep 11, 2012 (gmt 0)
If it's just a snippet and maybe one image with a link that makes it clear people should click through for the source - the way LifeHacker features sites - then I don't think a DCMA request will be successful. That practice is just too common, and I believe it's all considered "fair use" (you can Wiki that for more info).
If they're using snippets WITHOUT links, a DCMA may work. I haven't really had that situation myself.
If they're just copying full articles with or without images, OR using several images, the DCMA will work very well. I issue these for a few of my pages that people keep stealing outright periodically, and Google wipes them out of the index within days (two weeks, tops).
If they steal a whole page but leave a link to me, I still DCMA them. That link is never going to send you traffic or constitute a quality inbound. They're just making money off your content.
As for ehow, I'd say give it a shot - you'll know within days whether it worked. Rewording is, sadly, enough to get around the DCMA, but how much rewording? It may be that Google requires it to be exactly the same language before they'll do the DCMA, but there may be wiggle room if it's only slightly reworded. I think it's worth checking into. I'd also love to hear your results!