Unfortunately I have had to make the decision to stop operating Stone Age Online. Most of the code backing the game relies on outdated technology and there are several security risks in some fundamental components. It currently isn't feasible for me to perform a full audit and rewrite of the code. I am sorry if you were one of the users who still continued to play and enjoy the game.
I recommend trying out Wurm Online or Minecraft if you want to find a similar game.
Graham Edgecombe
Stone Age Online Developer
8th April 2011