Anybody else concerned about the shake up in page rank now Penguin 2.0 seems to have gone live? Doing my usual ranking check this morning; my key SERPs have been level or slightly improving over the last six months but all of a sudden, wham! For example Rankings of 8 down to 32, 6 down to 27, 22 down to 105! All my SEO planning is fairly standard white hat stuff so rather gutted to be hit so hard. Hoping it will settle down a bit but if anyone comes across any good articles on the subject please post.