Se acuerdan que Matt Cutts había confirmado en “World Camp” que Google podía interpretar los guiones en urls? Bueno, según el propio Matt Cutts (nuevamente?) no es tan así:

“I didn’t quite say that in the talk. I said that we had someone looking at that now. So I wouldn’t consider it a completely done deal at this point. But note that I also said if you’d already made your site with underscores, it probably wasn’t worth trying to migrate all your urls over to dashes. If you’re starting fresh, I’d still pick dashes.”

No está hecho. Simplemente hay alguien viendo eso ahora, que no es lo mismo.

Conclusión: Sigue todo igual (al menos por ahora).