Oddly enough, with the OGL, WotC lets White Wolf take a crack at D20. Engel, a German D20 game is quite good, despite my disdain for D20. The concept is great, and the artwork is incredible. White Wolf has translated the game to English for us English speakers.
White Wolf also did GammaWorld D20, Ravenloft, and their own entire line of Sword and Sorcery, including all of Monte Cook's books.
If I were convinced to playing 3E, I'd want to go with Arcana Unearthed, which is basically an alternative or supplemental player's guide with alternate magic systems, new classes, new races, new feats, etc. It's really good.
Rituals and Relics also presents some neat alternate magic rules.
Basically, WotC is allowing someone else to show them up at their own game.