The present disclosure discloses silicon waveguides with embedded active circuitry fabricated from silicon wafers utilizing photolithographic microfabrication techniques to define waveguide structures and embedded circuit recesses for receiving integrated circuitry. In some embodiments, porous, low-k dielectric materials are manufactured by forming a porogen-containing dielectric layer on a substrate and then removing at least a portion of said porogen from the layer. 65 kHz sub-carrier, for example, using QPSK modulation. In this arrangement the blade is mounted rotatably to the blade slider. The lead marketplace system and method provides an auction for leads.