Wiki Wiki Web (version 9)
I found these statements there particularly relevant:
The point is to make the Edit form simple and the FindPage search fast.
In addition to being quick, this site also aspires to Zen ideals generally labeled WabiSabi. Zen finds beauty in the imperfect and ephemeral. When it comes down to it, that's all you need.
Before you start editing you should also have a look at WikiEtiquette.