havent seen this here yet. i found it useful.
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Latest Google changes recently and it has been getting a lot of attention.
It's been a tough week for a lot of AdWords advertisers. With the recent update of Google's landing page algorithm, many marketers that had been paying five or ten cents a click (or less) are now required to bid at least 50 cents to a dollar or more. There are also reports of some advertisers who have kept their bid prices, but those bids are now buying only 3rd or 4th page ad positions, where they used to buy first page positions.
Note that not all AdWords accounts have been affected - ads going to large sites with lots of content have seen no changes to their bid prices.
Four kinds of sites are hardest hit:
1.One page sales letter websites
2.Squeeze pages (landing pages whose sole purpose is to gather an email address
in exchange for a free report)
3.AdSense sites (particularly AdSense arbitrage sites)
4.Affiliate sites
Get into the details of what's changed and how to deal with it:
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http://www.affiliateclassroom.com/x....1&aid=321&p=14