You don't seem to provide a USP (unique selling point) that would give a random interested individual much reason to join it over the 100s of other larger blogs, forums, etc., discussing such topics.

Creating some sort of portal that allowed access to a wide range of topics related to futorology, rationality, solutions toward a better future, strong AI, philosophy, etc., would be a huge boon and if you could put that together, I believe it would be a massive step forward.

Incidentally, I am a web developer and if anyone is interested in helping out with the project (it's just a concept at this stage, although very practical), I'd love to hear from you :)