Google launched the panda update on September 25th, which it suggested should help small sites. Google’s Pierre Far said on Google+
Earlier this week, we started a slow rollout of an improved Panda algorithm, and we expect to have everything done sometime next week. Based on user (and webmaster!) feedback, we’ve been able to discover a few more signals to help Panda identify low-quality content more precisely. This results in a greater diversity of high-quality small- and medium-sized sites ranking higher, which is nice. Depending on the locale, around 3-5% of queries are affected.
A new Penguin update is on the way as well, but we don’t know exactly when it will going to hit. It could be happen before the end of the year at the latest.
The lists of winners and losers from the Panda update, which are as follows:
Some sites that have lost and gained search visibility in Google,