Eric Enge gets the scoop–boy, is he gonna get a lot of backlinks from this–getting Matt Cutts to confirm something that I have suspected and cautioned clients for many years: 301′ing from an old domain to another, does result in PageRank decay. Here’s the quote:
I can certainly see how there could be some loss of PageRank. I am not 100 percent sure whether the crawling and indexing team has implemented that sort of natural PageRank decay, so I will have to go and check on that specific case. (Note: in a follow on email, Matt confirmed that this is in fact the case. There is some loss of PR through a 301).
So now you know. But, don’t stop there, read the rest of the interview, you may just learn some other propaganda SEO tips.