I am a Rackspace customer (fortunately, in VA). Last week, they accidentally sent emails out to many customers letting them know that there was heavy construction (that they don't control) adjacent to their lot of land in Texas. I'm betting that has something to do with it.
So what has really happened, or Rackspace does not go as far as explaining customers what was the reason and what measures are taken so it won't happen again? I'd be surprised if that is the case.
My current hoster costs less and does much more (you're informed and kept updated in case anything remotely serious happens, especially if it affects the whole DC - though happened only once during 6 years, customers had live progress on the failure resolution).
Oh? In the mail I got, they said the construction would be near their IAD data center which is outside of the Washington Dulles airport (which looking at the map is actually in VA).
> Beginning Thursday June 25, 2009, heavy duty excavation work on the property adjacent to Rackspace's IAD Data Center will commence. This project includes excavation work and quarrying of subsurface rock to lay a sewer line to serve a new development.