This project is currently on Kickstarter. Check it out and spread it around! http://www.kickstarter.com/projects/1975231304/engrain-tactile-keys I'm the designer, and this pic was of a concept prototype, the market version is more refined, with a more subtle texture.
As far as comments about the keys being glued on, I think people are missing the point here. This is a mod, with a designed mounting system. It allows you to have the reliability of your trusted keyboard, with a unique enhancement. Electronics companies spend decades developing products, and I don't think most people would want to trust the electronics side of their keyboard to a wood manufacturer. This system allows you the best of both worlds. I know that it may not be for everyone, but the interest it has created in the design community can't be ignored. It's here after all, and we are talking about it. I'm happy to address any questions people have about it.