browsee - 9:13 pm on Mar 7, 2011 (gmt 0)
it's important for webmasters to know that low quality content on part of a site can impact a site's ranking as a whole. For this reason, if you believe you've been impacted by this change you should evaluate all the content on your site and do your best to improve the overall quality of the pages on your domain. Removing low quality pages or moving them to a different domain could help your rankings for the higher quality content.
Wysz from Google just posted this comment on Google forum. One useful thing he mentioned - "Removing low quality pages or moving them to a different domain could help your rankings for the higher quality content.". I believe he is talking about sud domain. If so, it is good to move thin pages to a sub domain.