Looks like Google has changed its duplicate content filter to hit quite a bit harder!! I've got a few sites which are just there to accummulate PR and time around at the moment and most show the same 3 pages. Another two store sites have identical content but are on different domains to get at different KW. Now here is something astonishing: If I'm searching for ww*.sitea.com (sites are examples) on google, which is a copy of the older ww*.siteb.com then google shows SITE B, not site A, which it didn't do before the PR update. In addition, all sites with duplicate content appear as identical to the oldest site in the backlink tool, ie. backlink number, PR etc are reported as identical. Searches for site:ww*.siteb.com do not show anything. What is really strange is, this might (not at all sure about this, but might) be rather useful for getting PR fast: I had the abovementioned store sites, ww*.storea.com and ww*.storea.co.uk, with the .co.uk being new and nearly without IBL (1 PR4 link to get it indexed), and the .com site being older with many links and PR5. The .co.uk site was before the PR update indexed but not cached. I changed the content slightly after the PR update, and it is now cached with all subpages, but googling for ww*.storea.co.uk still shows ww*.storea.com. Now the hammer: Since the PR update, the PR of ww*.storea.co.uk, with next to no BLs, is the same as for ww*.storea.com, on all indexed pages (landing page is PR5, others all PR4). I've since added some BL as I didn't note this before - has anybody else seen anything like this? If this is a general phenomenon and we can get to a better understanding of how it works, this may be an interesting way to get rapid PR!