Penguin is a filter, not an algo update. Panda was an algo update and is being refreshed and tweaked frequently, generally at least once per month.
After the Penguin update, Panda 3.8 update had taken place on June 25th, 2012. @shadoze - Please note that Penguin is the Google's spam-fighting algorithm.
The latest I know is Panda & Penguin updates. That can be the latest change in algorithms of Google. But after that, I've got no news.
After the very first Penguin, there have been one Penguin refresh and 2 Panda refreshes, to the best of my knowledge. http://www.seroundtable.com/category/google-updates Just check search engine ranking for your site and see if a fall in rankings coincides with any of the updates' dates.