Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies in outer space to the canyons of the ocean. You can explore rich geographical content, save your toured places, and share with others.
If you're new to building 3D models with Google SketchUp, the training video tutorials are a great way to get started. They range from basic to more advanced topics, and are best watched in the order that they are listed. Though they're narrated in English, these videos contain a lot of visual information that non-English speakers will find helpful
Smustard is dedicated to providing SketchUp users with the tools and plugins they need to increase productivity and facilitate workflow. Smustard plugins are ruby scripts that add command features to simplify repetitive or difficult modeling management tasks. Some of Smustard's top scripts are: MakeFaces, Weld, Windowizer, Subdivide & Smooth, Drop, CAD Cleanup Tools, ProfileBuilder and, Randor.
Sketchucation is one of the most active discussion forums on SketchUp. You can find lots of ruby scripts as well as lots of helpful members should you need any help on Sketchup, from general questions to ruby programming.