Penguin 2.1 has officially been released today.

Matt Cutts, Google’s head of search spam announced it on Twitter:

I saw signs of this around 9am EDT this morning but didn’t see enough chatter to cover it yet. I suspect over the weekend the forums will light up. Some of the early stats I saw on sites that got hit were huge.

Of course it was a late Friday release:

I’ll have more details on this on Monday, with the impact on real webmasters.

For more details on Penguin click here.