Google moving to a bit more transparancy in quality score. Much more here: http://www.ewhisper.net/blog/google-adwords-quality-score-factors-demystified/

Some nice myths on quality score busted.

Search ad trust much lower than several forms of advertising.

Yahoo now allows blocking of individual domains, or subdomains like Google’s site exclusion feature.

Quick look into usability items to be aware of.

Social demographics are often older and more workplace diversified than we think.

Yahoo recently updated their T&Cs and continued advertising after 10/29/2007 will constitute acceptance of the updated terms.