CS-Nation: What changes have been made to the maps ported to CS: Source?

Jess Cliffe of Valve Software: The texture resolution for maps has quadrupled. We can now also add a 3D skybox so maps can look as though they span miles. This serves to make levels less like an arena and more like a realistic location. In addition, designers have the flexibility to specify whether a prop is static, physics, or client side debris. We can also take advantage of features such as normal mapping and specularity in order to give textures extra depth and reflectivity.