It seems Google has quietly released a new major upgrade for SketchUp that includes model geolocation, color imagery, and a new tool called ‘Building Maker’.  They’ve added improved tools for photo matching, and all around seem to have done a good job of adapting SketchUp to be a great tool for architectural modeling.

The pro version adds support for basic constructive solid geometry operations like union, intersection, and subtraction, as well as some CAD-like features such as angular dimensions and volume calculation.

Google SketchUp.