I just like to point to the ibpedia.nl community project, that aims to be a research portal for information security professionals.
The project was started by a few Dutch enthusiasts, who (in vain) tried to use wikipedia for knowledge sharing. Due to the fact that a lot of knowledge was still in research phase, wikipedia could not host the items, so a new wiki was started.
ibpedia got its name form the ib abbreviation: Informatie Beveiliging, Information Security for those who are not familiar with the Dutch language. But, there's also a lot of content in English.
The content of ibpedia is published under a creative commons license, so free to share and add to. Don't hesitate to join the community.