I am a contributor to the Wikipedia. The Wikipedia is a project to contruct a free encylopeida in every language. With over 430000 articles in the English version, your subject of interest is bound to be in there. Anyone can take part, just find an article you like, then click edit this page to start editing the article!
To help bring more contributors, why not write a journal entry about it in your journal, and why not set your slashdot user home page to your favourite article, so it will get more attention?