Tesla announced their Supercharging plans on 9/24/2012 and updated them on 5/30/13.
Supercharger | Tesla Motors
We already have a few places this is being discussed but thought they should be consolidated in a new thread since the Supercharger network will apply to the Model S, Model X and possibly future models.
Prior threads are
Tesla DC charging network
Exciting Charging Announcement Speculation
Also, look at the excellent resource started by daxz
Suggested Supercharger Locations
and the map related to that
Tesla Supercharger Desired Locations
Tesla Supercharge Map estimator
Will update this thread as appropriate.
Good news that Tesla will be targeting locations along highways where food and coffee can be found. Exactly the correct strategy I think.
TMC Wiki of Supercharger locations here
Tesla Supercharger locations - Tesla Motors Club - Enthusiasts & Owners Forum
Thanks to Laurent for the screen grabs above and below
And to PhilBa for the overlay of the interstate highway system below: