This article by Phil Plait gives a general overview of what the image of the Black Hole tells us. For those who want to know how to interpret the image and a sense of the scale of the image, read this.
This article gives more background on the why the image was taken, how it was done, and what it tells us about physics in general.
Good for those who want an overall picture into what the image of the Black Hole tells us about how we imagine the universe to be.
For those interested in the technology behind getting the image of the Black Hole, read this article.
For those who really want to dive in, here is the special issue with the papers on the Black Hole. It's Open Access.
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