Google's Penguin 2.0 update is now in effect.

Check your rankings. Either you or your SEO vendor (or ideally, both) should be keeping track of how you're ranking for important unbranded keywords. Did your rankings move for terms like "[city] [brand] dealers" if you're in or close to a metro area? How about your inventory terms like "2013 [make][model][metro]"?

I spent time last night doing spot checks on dozens of clients and they all either stayed the same or moved up for their important searches. That doesn't mean that our strategy moved them up, but that their competitors' strategies moved their own sites down. I've seen which some of the vendors that were negatively impacted by the change but I'd love to hear from anyone on dE about their experience and offer advice (not to mention the advice that will be offered in the comments here) on how to make it right if you were hit.

If you don't have access to your keyword history to see definitely whether you've moved up or down, I'll revive this thread in a month to have you all look at your analytics. Sometimes, it's not easy to see if you've been successful or failed until you get to see the actual data in action.