From the Yahoo Search blog. Worth a read if you’re into this stuff. I think we’re going to see some breakthroughs in this area thanks to new services like Twitter and others adding a layer of real time data.
So far, semantic technologies have been used in commercial products for data integration, enterprise semantic search and content management, etc. I expect this area to grow, but prospectively I see more and more potential for business opportunities in the combination of the social web and semantic technologies as well as in the context of mashups. An area that is also still largely unexplored is the area of advertisements in the context of semantic search.