We describe the properties and potential applications of an electronic material that consists of an interconnected random network of single-walled carbon nanotubes. This material possesses useful electronic properties, and it can be patterned into devices with high yield using conventional microfabrication technology. One unique aspect of this material is that every atom is a surface atom. For this reason nanotube networks form an ideal electronic material to utilize interface phenomena to engineer its properties for specific applications. We discuss two such applications: chemical sensing and macroelectronics.