aakk9999 - 1:23 pm on Jul 30, 2010 (gmt 0)
A year ago, sitewide tinkering in such sensitive areas would have earned you a series of page-penalties
A year ago we have also done such changes sitewide (changed 200+ duplicate page titles, adjusted headings, internal link anchors etc) and also suffered no penalty, in fact oposite - there was no drop at all and ranking started to improve immediately with significant positive results (avg. 10+ pages improvement) and is still holding.
Otherwise, how could you ever attempt to fix the site without suffering 3-months penalty?
Or do you think that Google would be be making a distinction between "sitewide fix" and "tinkering"?