[raju2011]

Here’s the Panda update schedule so far, as we’ve tracked and had confirmed by Google:
• Panda Update 1.0: Feb. 24, 2011
• Panda Update 2.0: April 11, 2011 (about 7 week gap)
• Panda Update 2.1: May 10, 2011 (about 4 week gap)
• Panda Update 2.2: June 16, 2011 (about 5 week gap)
• Panda Update 2.3: July 23, 2011 (about 5 week gap)
• Panda Update 2.4: August 12, 2011 (about 3 week gap)
• Panda Update 2.5: September 28, 2011 (about 7 week gap)

Key recovery strategies are around:
• Creating valuable content (so the page is the best answer to the query on the web)
• Consolidating approximate duplication (if lots of pages on the site about the same topic)
• Getting rid of exact duplication (syndication, manufacturer feeds and other measures that result in the exact text appearing on multiple sites)
• Improving usability (such as ensuring a valuable and engaging user experience, providing easy and useful navigation, not obscuring the content with an overwhelming amount of ads)
• Working on engagement (building a site that people want to stay on, link to, return to, share, and otherwise show happiness towards)
- says SearchEngineLand