Chatroulette is currently not available. The Chatroulette that we've all known has apparently just been an "experiment". It will be back today, however, if a message on the site is any indication. If you go to the site, it says, "The experiment #1 is over now. Thanks for participating. Renewed and updated version of the website will be launched today." That's the only info that was given, but I guess we'll know more details soon enough.