Damn - I'm going to have to cancel some appointments to make this. An impressive speaker and topic - Mike (cofounder) and I are looking forward to it. :)
I must admit to being a bit skeptical about the semantic web in general though.
I'm "researching"/teaching myself knowledge representation and knowledge management at the moment. I read a lot about the Semantic Web and how it will be the most wonderful thing, but I suspect that we will just end up with "tag soup".
The only way to make it work is to have a computer model that represents human concepts (this was why we started our company actually) None of the current representation schemas do the job, so unless someone comes up with a new model, the power of the programming language you use won't help much. I think with the right model, though, deploying in Lisp could be pretty powerful. It requires serious epistemology work and also logic. I think Fred Sommers has the right logic for the job, but the conceptual model is still needed.
I must admit to being a bit skeptical about the semantic web in general though.