The Stanford Encyclopedia of Philosophy is definitely a step up from Wikipedia's coverage of philosophy, but it comes from a strong and pretty obvious Analytic point of view. For coverage from other points of view (which arguably give more accurate and informed accounts of non-analytic philosophy), you have to resort to classes or books.

It’s a great example of what an editorialized online encyclopedia can be. Would love to learn about other such resources for other fields.

Great article and discussion on it here for anyone trying to build something similar:

https://news.ycombinator.com/item?id=10266103

Note that there's also the "Internet Encyclopedia of Philosophy" which is, such as the SEP, written by professional Philosophers.

http://www.iep.utm.edu/