An interesting presentation on connecting learning objects, which consists of an (imaginary) use-case of blog technology in (e)learning environments.
It focuses on the distribution of learning objects (enhanced through RSS), collaboration among educators (through Weblogs) and automatic enhancement of the meta data surrounding the learning objects (through Trackbacks when they are used or discussed, building a library of example uses). Trackback as a protocol is really simple to implement and this presentation shows how other applications than blogs can benefit from it.