Use these search terms, be sure to insert your keyword phrase where it says "add your keyword"
site:.com inurl:blog "post a comment" "ADD YOUR KEYWORD"-"comments closed" -"you must be logged in"
site:.org inurl:blog "post a comment""ADD YOUR KEYWORD" -"comments closed" -"you must be logged in"
site:.edu inurl:blog "post a comment" "ADD YOUR KEYWORD"-"comments closed" -"you must be logged in"
site:.gov inurl:blog "post a comment" "ADD YOUR KEYWORD"-"comments closed" -"you must be logged in"
site:.com "powered by expressionengine" "ADD YOUR KEYWORD"
site:.org "powered by expressionengine" "ADD YOUR KEYWORD"
site:.edu "powered by expressionengine" "ADD YOUR KEYWORD"
site:.gov "powered by expressionengine" "ADD YOUR KEYWORD"
site:.com ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog "post a comment" -"comments closed" -"you must be logged in" "ADD YOUR KEYWORD"
site:.org ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog "post a comment" -"comments closed" -"you must be logged in" "ADD YOUR KEYWORD"
site:.edu ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog "post a comment" -"comments closed" -"you must be logged in" "ADD YOUR KEYWORD"
site:.gov ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog "post a comment" "ADD YOUR KEYWORD"
site:.edu ?your keyword?
site:.gov ?your keyword? -?you must be logged in? -?comments are closed? "ADD YOUR KEYWORD"
site:.edu ?no comments? +blogroll -?posting closed? -?you must be logged in? -?comments are closed? "ADD YOUR KEYWORD"
site:.gov ?no comments? +blogroll -?posting closed? -?you must be logged in? -?comments are closed? "ADD YOUR KEYWORD"
site:.edu ?powered by expressionengine? ?ADD YOUR KEYWORD?
site:.gov ?powered by expressionengine? ?ADD YOUR KEYWORD?
site:.com ?powered by expressionengine? ?ADD YOUR KEYWORD?
site:.org ?powered by expressionengine? ?ADD YOUR KEYWORD?
site:.edu ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog ?post a comment? -?comments closed? -?you must be logged in? ?ADD YOUR KEYWORD?
site:.gov ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog ?post a comment? -?comments closed? -?you must be logged in? ?ADD YOUR KEYWORD?
site:.com ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog ?post a comment? -?comments closed? -?you must be logged in? ?ADD YOUR KEYWORD?
site:.org ?Powered by BlogEngine.NET? "ADD YOUR KEYWORD"
site:.edu inurl:blog ?post a comment? -?comments closed? -?you must be logged in? ?ADD YOUR KEYWORD?
The quote marks and minus signs are critical.
Use frefox with the SEO Quake add-on, set goog to give you 100 results per page, and sort the page with the seoquake bar by PR.
Hope this helps.