...posts that are closely related," explains the FAQ. It seems that Google Blog Search didn't select some authoritativeblogs to be listed on the homepage and almost any blog post could be included in a Blog Search cluster. There are 11...
http://googlesystem.blogspot.com/2008/10/google-news-for-blogs.html
...the http header is NOT the <head> section of the file - they are two different things. I have read in non-authoritativeblogs that an x-robots directive can be added to the .htaccess file on an Apache server, but I cannot confirm that...
http://www.webmasterworld.com/google/3994307.htm