There are many internet marketing blogs run by large companies and organizations. However, it is refreshing to see some of the personal blogs of internet marketers voicing their opinions on online marketing. These are some of the most popular and established personal internet marketing blogs I have found.
http://www.johnchow.com/ – Run by John Chow
http://www.shoemoney.com/ – Run by Jeremy Schoemaker
http://www.quicksprout.com/blog/ – Run by Neil Patel
http://okdork.com/blog/ – Run by Noah Kagan
http://www.smartpassiveincome.com/ – Run by Pat Flynn
http://www.viperchill.com/ – Run by Glen
http://www.problogger.net/ – Run by Darren Rowse