TopTen SketchUp Sites
Google SketchUp, SketchUp Blog, SketchUp articles, Google SketchUp Plugins

Libraries
1001bit tools, SketchUp Ruby Library, SMustard

Productivity
3skeng, EditInPlace, Modelur, Render Plus, RPS Productivity Tools, SU Animate

Rendering Inside 
Indigo Renderer, LightUp, Render[in], SU Podium, Shaderlight, Twilight Render, V-Ray

Rendering Outside
3DPaintBrush, Artlantis, Kerkythea, Maxwell Renderer

Viewers
AR-media Plugin, e-Drawings for SketchUp, ICEvision, RPS 3D PDF Exporter

Workflow
CADspan, IFC2SKP, i.materialize, PolyTrans, SimLab 3D PDF exporter

Reviews
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