In my opinion, the most active and helpful official search engine representative at the forums (WebmasterWorld & Search Engine Watch Forums) is the AdWordsAdvisor. For those that frequent the WMW AdWords Forum and the SEW AdWords Forum, you will notice the volume of posts and replies by AdWordsAdvisor & AdWordsRep, respectively.
Here’s what you’ll find when you visit adwords.blogspot.com… - Updates on enhancements we've made to the system - Thoughts on things that advertisers have been asking about - Tips on getting the most from AdWords - Details on tools we think you'll find useful - Links to articles you might find interesting
This was announced at WebmasterWorld this afternoon. Jensense, points out that adsense.blogspot.com, "returns a password protected message, which hopefully means we will be seeing an Inside AdSense blog in the near future, as well."