Planet13 - 6:06 pm on May 11, 2011 (gmt 0)
I'm also seeing some thin affiliate sites with poor layout & scrapped content(could be new sites) at favorable rank.
Have you looked at their backlink profile? I am guessing lots of "networked" sites that they own with targeted keywords in the anchor text. Also I wouldn't be surprised if they have lots of other spammy backlinks on abandoned sites.
It does seem like post panda, a lot of the SEO tactics circa 1997 - 1999 are back in play.