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As in "extraordinary claims demand extraordinary evidence".

A summary of the evidence can be found on Ben's blog

Adding some more info... Basically the evidence can be divided into two parts. 1) Evidence that the OpenCog design (or something reasonably similar) would be a successful AGI system when fully implemented and tested. 2) Evidence that the OpenCog design can be implemented and tested within a decade.

1) The OpenCog design has been described in considerable detail in various publications (formal or otherwise); see http://opencog.org/research/ for an incomplete list. A lot of other information is available in other papers co-authored by Ben Goertzel, talks/papers from the AGI Conferences (http://agi-conf.org/), and the AGI Summer School (http://agi-school.org/) amongst other places.

These resources also include explanations for why various parts of the design would work. They use a mix of different types of arguments (i.e. intuitive arguments, math, empirical results). It doesn't constitute a formal proof that it will work, but it is good evidence.

2) The OpenCog design is realistic to achieve with current software/hardware and doesn't require any major new conceptual breakthroughs. Obviously it may take years longer than intended (or even years less); it depends on funding, project efficiency, how well other people solve parts of the problem, and various other things. It's not realistic to estimate the exact number of years at this point, but it seems unlikely that it needs to take more than, say 20 years, given adequate funding.

By the way, the two year project mentioned in that blog post is the OpenCog Hong Kong project, which is where ferrouswheel (Joel Pitt) and I are currently working. We have several other people here as well, and various other people working right now (including Nil Geisweiller who posted before as nilg).

I'm one of the leaders of OpenCog, and I can tell you that these accusations are spurious and bizzare. Regarding installing dependencies and compiling the code, detailed instructions are provided on our wiki. All the major features have been released (as they were ported/cleaned up during 2008 and 2009).

Some interesting features were previously implemented in Novamente but during rushed commercial contracts, in a hacky way that means it's easier to re-implement them now. Sometimes people have difficulties compiling the code, but we help them if they show up on IRC (I don't remember Louie though).

I'm in Hong Kong for the OpenCog-related project here (http://opencog.org/2010/10/opencog-based-game-characters-at-hong-kong-poly-u/). I'm a "transplanted Westerner", originally from New Zealand (moved here about 2 months ago). Available basically any evening.