It's been quite a day for newsletters. First of all, I sent out my dry run of a new paid, audience engagement newsletter that I'll formally launch later in the week. But my friends over at Ghost also launched a new site to support their weekly newsletter Publisher Weekly:

Our main focus is to cover what is happening at the intersection of business models, technology and modern journalism. We are seeing emerging business models taking the place of digital advertising, with more and more publishers of all sizes beginning to build sustainable businesses on top of publishing. We're bringing all of this information together so that publishers like you can stay ahead of the curve.

The website itself includes a whole bunch of resources including the most important tools for building successful publications, as well as useful newsletters, podcasts and online information covering all things publishing.

It's useful — and free.