On the topic of getting access to AdSense data--you can also get keyword prices from yahoo/overture, which are (I believe still) freely available once you sign

On the topic of getting access to AdSense data--you can also get keyword prices from yahoo/overture, which are (I believe still) freely available once you sign up for an advertiser account. SEOs and domainers use Yahoo's keyword price data, which is generally assumed to be pretty similar to Google's.