Current prolonged downtime made me realize that StackExchange needs a page showing status of all network sites similar to Twitter Status or Last.fm Status.
Such page would a single place to post information about planned maintenance windows (example), quick updates during unplanned outages (example) and maybe statistics from some website monitoring service. It should have simple address.
It has to be hosted in a different datacenter than the ones used by SE sites or use a 3rd party service (e.g. Twitter uses Tumblr for this).