Coincidentally I was updating a “indexing your package” wiki page where I added a section for encouraging making an announcement, as well as a small template. So obviously +1.
On a related note, to discuss improving the ROS’ already-amazing infrastructure that has helped us (semi-)automate non-coding tasks, I opened some tickets. Ideas behind is that package indexing and package’s wiki page are the keys that help us to find, reach existing packages.