Overview / Transition-Metal Nanoclusters: Solution-Phase Synthesis, Then Characterization and Mechanism of Formation, of Polyoxoanion- and Tetrabutylammonium-Stabilized Nanoclusters / Magic Numbers in Clusters: Nucleation and Growth Sequences, Bonding, Principles, and Packing Patterns / Modeling Metal Nanoparticle Optical Properties / Electrochemical Template Synthesis of Nanoscopic Metal Particles / Nonlinear Optical Properties of Metal Nanoparticles / Electrochemical Synthesis and Optical Properties of Gold Nanorods / Surface Plasmon Resonance Biosensing with Colloidal Au Amplification / Self-Assemblies of Nanocrystals: Fabrication and Collective Properties / Electrodeposition of Metal Nanoparticles on Graphite and Silicon / Synthesis, Characterization, and Applications of Dendrimer-Encapsulated Metal and Semiconductor Nanoparticles / The Electrochemistry of Monolayer Protected Au Clusters / Nanoparticle Electronic Devices: Challenges and Opportunities