Contents: Silicon Nanocrystals Enabling Silicon Photonics (N Daldosso & L Pavesi); Theoretical Studies of Absorption, Emission and Gain in Silicon Nanostructures (E Degoli et al.); Computational Studies of Free-Standing Silicon Nanoclusters (O Lehtonen & D Sundholm); Optical Gain in Silicon Nanocrystal Waveguides Measured by the Variable Stripe Length Technique (H Chen et al.); Si-nc Based Light Emitters and Er Doping for Gain Materials (O Jambois et al.); Silicon Nanocrystals: Structural and Optical Properties and Device Applications (F Iacona et al.); Optical Spectroscopy of Individual Silicon Nanocrystals (J Valenta & J Linnros); Silicon Nanocrystal Memories (P Dimitrakis et al.); Engineering the Optical Response of Nanostructured Silicon (J Diener et al.); Guiding and Amplification of Light Due to Silicon Nanocrystals Embedded in Waveguides (T Ostatnický et al.); Silicon Nanocrystals in Silica: Optical Properties and Laser-Induced Thermal Effects (L Khriachtchev); Light Emission from Silicon-Rich Nitride Nanostructures (L D Negro et al.); Energy Efficiency in Silicon Photonics (B Jalali et al.); Light Emitting Defects in Ion-Irradiated Alpha-Quartz and Silicon Nanoclusters (J Keinonen et al.); Auger Processes in Silicon Nanocrystals Assemblies (D Kovalev & M Fujii); Biological Applications of Silicon Nanostructures (S M Weiss).