The Fedora planet that is. :) The old site: http://planet.fedoraproject.org/ will continue to work and redirect to the new site: http://fedoraplanet.org for quite some time to come, but you should go update your feed links now while you are seeing this. :) Why did we do this change? It's part of us trying to make sure everything in *fedoraproject.org is using https. This allows us to set a HSTS header to get all browsers to use https with fedoraproject.org sites and also get that preseeded in some browsers. planet.fedoraproject.org shows blog posts of the entire Fedora community and those posts may well have http links in them, or https links to self signed certs or the like, so there isn't any way to make planet.fedoraproject.org fully valid https, so we moved it to it's own domain where it can happily use http until browsers no longer accept it. This brings us one step closer to a https future. :)