Fuse.tv released a video about the business ventures of Linkin Park. Besides the sound of Linkin Park, there are particularly other things that emphasize the guys.
For example Open Laps, it´s a music software program, that enables you to create your own music and share it to the world.
Besides that, they designed some boots for Sebago, a Foot Wear Line. They also supported Music for Relief with this project.
Another feature is SURU from Joe Hahn, a fashion shop with art related items.
All these experiences are really constructive for the band, but see for yourself: