DotA-Allstars.com was the first Defense of the Ancients official community fan-site launched by Pendragon in the late 2004. It was the most popular DotA community site which gathered around 1 million members but, now Pengdragon has decided to take the close the forums.
About a year ago when DotA-Allstars community was on peak. Pendragon joined Riot Games to work as an advisory on League Of Legends. Due to Pendragon lack of interest in DotA, IceFrog was not happy with it he moved and created PlayDota.com as DotA's next official community portal. The DotA fans followed IceFrog's decision and did the same thing joining the new PlayDotA forums. Now, the DotA-Allstars forums were almost dead, 90% of the members moved to their new home.
Pendragon_ the webmaster of DotA-Allstars.com has closed the forums. You can not discuss there anymore, if you visit the site, you'll see a letter from Pendragon about the history and his Riot Games partnership. He also mentioned that the forums are closed and all the content are being permanently moved to the new server for archiving purposes.
Anyway, Thanks to Pendragon for his efforts in building former DotA-Allstars community.