Dr. Awkward said:
Okay, boiling it down to this, I just disagree. The creators and publishers have given permission to use their work in this manner. Whether it would be advisable or responsible to do so is another issue. As others have pointed out, it would probably cause a decrease in the quality and quantity of d20 material. It simply for reasons of the logistics of maintaining it and the consequences of its existence would not be a good idea to create a d20 wiki. But it wouldn't be an affront to the publishers that created the open content used. If they take offence, they didn't understand the agreement that the OGL demands of them.