Just browsing around Wikipedia. If you haven't heard about it, it's a non-profit initiative to create a free encyclopedia. And it's great. It's very useful and informative. Combines external links, current events and relevant information to ensure what you are reading is not only useful but also up to date and gives you the option of exploring further.
Have a look at the Unicode and HTML for example. Not only does it give a list of other unicode standards, what Unicode is and how it is used in HTML and browsers, but also gives a reference of unicode characters! Wikipedia goes beyond what you expect from an encyclopedia.