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Here is a link to the conceptart.org wiki page.
Right now the Wiki is relatively barren in it's content, but since the wiki is entirely user generated I suggest we all get in there and add what we can and learn what we can.
The wiki is quite useful.
Got my answer on angles ^^
I am using wiki from long time and its always provide the answers of all type of questions. Of course some time found the wrong answers here but mostly its work very well.
Just wanted to say that the link to the wiki seems to be broken ( just registered to tell you that ).
Have a good day !