Planet Wikimedia is now alive. This is an on-topic aggregator for posts about wikis and Wikimedia projects, by Wikimedia project participants and MediaWiki developers. See the instructions for getting added to the global feed. This is an opt-in process, partially to ensure that everyone submits a filtered feed, but also to avoid copyright concerns about aggregation.
Any developer with MediaWiki Subversion access can edit the planet configuration file, which will be updated regularly. This is not quite as open as putting the configuration in a wiki, but hopefully is a sufficient clue barrier to avoid accidental breakage.
Please spread the word, and submit your blog.