I ran across a set of slides by Tim Berners-Lee on what's happening at the Laboratory for Computer Science on the semantic web project. Interesting stuff. Reminded me that I probably need to dig deeper into this. There some interesting parallels between this and thoughts on application layer internetworking. In particular, see the slide on the application integration hub. There is also a interesting research wave front slide that gives a good idea of where interesting open problems are likely to be.