Some of the blogs on Pentesting by some of the best researchers

Pentesting blog sources

 http://pentestmonkey.net/blog
http://jeremiahgrossman.blogspot.com
http://www.darknet.org.uk
http://spylogic.net
http://taosecurity.blogspot.com
http://www.room362.com
http://blog.sipvicious.org
http://blog.portswigger.net
http://blog.c22.cc
http://carnal0wnage.blogspot.com
http://www.mcgrewsecurity.com
http://www.gnucitizen.org/blog
http://www.skullsecurity.org/blog
http://blog.metasploit.com
http://www.darkoperator.com
http://blog.skeptikal.org
http://preachsecurity.blogspot.com
http://www.tssci-security.com
http://www.gdssecurity.coml/b
http://websec.wordpress.com
http://bernardodamele.blogspot.com
http://laramies.blogspot.com
http://www.spylogic.net
http://blog.andlabs.org
http://xs-sniper.comblog
http://www.commonexploits.com
http://www.sensepost.comblog
http://wepma.blogspot.com
http://exploit.co.il
http://securityreliks.wordpress.com
http://www.madirish.net/index.html
http://sirdarckcat.blogspot.com
http://reusablesec.blogspot.com
http://myne-us.blogspot.com
http://www.notsosecure.com
http://blog.spiderlabs.com
http://www.corelan.be
https://digi.ninja/blog.php
http://gynvael.coldwind.pl
http://www.pentestit.com
https://www.shellntel.com