First, Let's talk about viewing options
Cycling Fans has the full story and probably umwolverine will provide a couple direct links.
For non-US viewers (and possibly US viewers as well): ETB supposedly will start at 15:55 CET or 9:55 am Eastern. There may well should be other links as well.
For US viewers only: Universal Sports has a geo-restricted feed starting at 9:35 am, Eastern. A few words about this option. I have a Mac and while Safari works fine, Firefox doesn't. Also Windows users supposedly can enlarge the video to fit the screen, but I can't do that on my Mac. Here is the video help page for Universal if you can't get it to work right off.
First, Now about this stage
It's a tough one. Here is the course profile- 
Five cat 3 climbs and three cat 2's. The last cat 2, the Alto Lazkaomendi, peaks 7.4 km from the finish. There's a down hill then the last 3.5 km rises about 40 meters.
Who's racing? Contador is the defending champ, Evans came in 2nd, and Evans' new teammate, Dekker, came in 3rd last year. By team:
Astana- Contador, Brajkovic, Horner, Rubiera
Caisse d'Epargne- Lulu, J-Rod, Arroyo, Moreno, Kiryienka (no Valverde)
Saxo- Both Schlecks, Larsson, both Sorensens, etc,
Columbia- Lovkvist, Rogers, Siutsou, Monfort, etc.
Euskaltel- Sam San, Martinez, Nieve; Garmin- Vandevelde, Zabriskie, Pate, Danielson, Hesjedal; Cofidis-Moncoutie; Fuji- Cobo, De La Fuente
Liquigas- Kreuziger, Nibali; Cervelo- Sastre, Gerrans; Lotto- Evans, Dekker, Van Den Broeck; Lampre- Cunego, Bruseghin, Gasparotto;
Katusha- Colom, Pfanenberger; Rabobank- Gesink, Freire, Mollema; Milram- Leeeenos, Wegmann, Knees; Fuji- Cobo, De La Fuente