Just came across this while reading up on ANN. Nico Nico Douga has started and english beta.
http://www.animenewsnetwork.com/interest/2011-04-20/japan-nico-nico-douga-video-site-starts-english-beta
http://2chan.us/wordpress/2011/04/20/nico-nico-douga-opens-in-english/
"Unlike the other language translations, this is a new site design, but JP accounts work. And nobody has commented on anything yet, so go nuts.
As for English-speaking user features, it seems they’ve added Facebook login, and you can add Nico-style comments on Youtube videos. Which I’m pretty sure was a feature on nicovideo.jp until Youtube blocked them…
Also the videos don’t load half the time, just like the original."