I am starting to build a new section of my site dedicated to newsletters on KM and related subjects. I only have three or four newsletters at present and have yet to create the section page but here is one of the KM newsletters for you to be going on with. Its from Nick Milton and Tom Young of Knoco.
Please let me know if you are aware of any other publications.
Nick and Tom have a YouTube channel with over 40 KM videos that you may also find of interest.