Probably Approximately a Scientific Blog : Language processing techniques explained for laypeople.

AI perspectives : A highly informative blog on AI technologies, but sometimes shallow conclusions.

Moral Robots : A blog on similar topics

Writer of Minds : Another interesting talking AI project, similar to Arckon.

AI Enthusiast : Projects and explanations of neural networks.

Kuki : The most entertaining online chatbot, regular winner of the Loebner Prize.