It's probably best known Bitcointalk phishing website. There is one difference from original website - on login page you will see invalid captcha key, so it's impossible to login to phishing website. Don't try to fill your login data there, if you have done it - change your password immediately.
Maybe it's not totally related to this topic, but I can tell short story about "alternative" domain of Bitcointalk. 3 or 4 years ago when I still didn't had account on this forum I saw one user saying that Bitcointalk have alternative domain. He said that it was created because Bitcointalk.org is banned in China and maybe in Russia, so domain was made for users from these countries. But in reality Bitcointalk have only one original domain - Bitcointalk.org.