http://www.wikipedia.org/
On this website they have a wide range of articles that can be edited online; many of these articles based on chess openings and chess in general. But they aren't as good as they could be.
An example:
http://en.wikipedia.org/wiki/List_of_chess_openings
From this you can tell that dozens of openings are missing.
Share me some of your thoughts on some of these openings and variations and maybe we could write some articles for the site.