Came across this article today on logo design with hidden messages. Great article that goes a long way to explaining what makes a great logo.
http://www.graphicdesignblog.org/hidden-logos-in-graphic-designing/
Stephen Gale's blog. I have no excuses - these are subjects that interest me - goodness knows if anyone else is interested in the same ones! They cover technology, Photography, Strategy and Design related topics. Plus some other loosely associated material!