A lot of the online marketing sites as I'm sure you see are geared towards online entrepreneurs. 2 great sites I believe Brick & Mortar business owners can receive great online marketing take-aways are Social Media Examiner & Duct Tape Marketing. Both always have great tips that SMB's can implement in their business.
Here is a great up-to-date guide on Online Marketing that is very insightful. It is provided by Neil Patel and was just released last week. http://www.quicksprout.com/2013/11/07/the-beginners-guide-to-online-marketing/