Google Page rank Update

If you haven’t noticed, the Google Pagerank update is becoming more frequent as of late. In the past 2 years, the average between updates was approximately 3 months, but the last 4 updates have come much sooner.

Last 6 updates
January 1, 2009
April 1, 2009 – 3 months
May 8, 2009 – 23 days
May 19, 2009 – 11 days
May 27, 2009 – 8 days
June 23, 2009 – 26 days

As you can see the updates are more frequent prior to April 1st update. It looks like Google is making changes to not only the frequency of their updates, but also how it handles SERP (Search Engine Result Pages).