I was looking across all my sites in RankRanger and i have to scroll past Yahoo before i look at Google. But I kept noticed that 80% of my sites have jumped in Yahoo this morning. Like 10 out of 12 core keywords increased to the first page. I've no idea why this happened though. Oh also i thought it might be worth pointing out that i've been working on anchor text ratios for a site hit by Penguin, some keywords returned to page one and two this morning, which could indicate a Penguin refresh.