There is a huge difference between giving away a year-old product and giving away a brand new, never-been-sold-before one.

Let me explain.

Radiohead took a -huge- risk by releasing an album, out the door, right at the start, with a "pay what you want" pricing model.

2dboy is taking -no- risk by releasing World of Goo with a "pay what you want" pricing model. They are already on the tail end of the demand curve at the $20 price point, they are just using this as a chance to capture more of the market at a smaller price.

Radiohead took a huge swing with their pricing model, 2dboy didn't. It's a completely different situation.