Joining Dots publishes a regular newsletter, aggregating blog posts, research and links collected. It is supposed to be released monthly, but sometimes we can get a bit too distracted by the research (oh, and client projects too)
The online version is posted on the blog. To receive via email, send an email to info@joiningdots.net. A separate SharePoint-specific newsletter is issued on roughly the same timescale. You can subsribe to that one too from here, just mention which newsletter(s) you want to receive: Joining Dots and/or SharePoint