(edit 18.10.2018, ScubbX: you can now also access the weekly notes via the URL https://www.openstreetmap.at/wochennotiz
Since I realised at AGIT that the OSM weekly notes are not as well known as I thought, there is now a direct link to the latest issue at https://www.openstreetmap.at.
About the OSM Wochennotiz itself: the latest news on OSM and other open source projects in the GIS sector is compiled here. This means that by regularly checking these blog posts, you can get a very good overview of what is currently happening in the communities and in this sector in general.