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There is currently no way unless you are running an active campaign to track the DA / PA. There is no function (or at least none I know of ) to see past DA / PA values. That might very well be on a number of wish lists and something in the offing....  but for now - no dice.  I think the costs for rolling this out and the infrastructure needed has in the past made it not possible. On a separate note, there is a historical page rank checker here:  http://www.seomoz.org/toolbox/pagerank For anyone wondering what PA (Page Authority) and DA (Domain Authority are, here is a good article: http://www.seomoz.org/learn-seo/domain-authority

I'm following up on old questions here, and wondering how this ever turned out for you. Are you back to your previous traffic yet? Do you have any hints for others in this situation (as yes, we have seen other people in this situation!). Thanks!