Knowledge and information spanning multiple information sources, multiple media, multiple versions and multiple communities challenge the capabilities of existing knowledge and information management infrastructures by far — primarily in terms of intellectually exploiting the stored knowledge and information. In this paper we present some semantic web technologies of the EU integrated project X-Media that build bridges between the various information sources, the different media, the stations of knowledge management and the different communities. Core to this endeavour is the combination of information extraction with formal ontologies as well as with semantically lightweight folksonomies.