Joost began streaming "Koi Koi Seven" as of today, an ecchi fan-service anime series that aired in Japan back in 2005, on its GONG Native channel (uncut sub-only series). The streaming is notable because the series has never been previously released in America before. The first five episodes are up now, with the rest expected to follow. Joost also began streaming the anime series "Saiyuki" on GONG Native today as well, though that series has been licensed & released on DVD in the US before. The first five episodes of "the Slayers" were also recently added to the dub GONG channel on Joost.
Video site Vuze (which actually predates Crunchyroll & others in their efforts to legally release new anime online for free, but never really caught on in popularity) announced a little over a year ago that they'd be adding "Koi Koi Seven" to their service, but as far as I can tell this never happened. Thus marking this the first time the series has been released in America.
Although Joost still lags behind other legal anime streaming sites like Crunchyroll, Hulu, & FUNimation (both in terms of content & general popularity), "Koi Koi Seven" is not their first exclusive title. They've also been streaming "Kaiji" & "Buzzer Beater" for sometime now, two other series which have not been licensed or released on DVD in America. Joost is also one of the websites streaming new episodes of Naruto Shippuden & Shikabane Hime shortly after they air in Japan, as well as many other titles. Check out the rest of the first five episodes of their newest exclusive series below: