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Oscarlok has been working on a great plugin that mimics the capabilities of the Boolean Tools recently introduced on SketchUp 8 Pro version. These tools are not available in the Free versions of SketchUp.
OSCoolean.rbs is a Plugin for SketchUp 8 Free that allows you to use Boolean Tools in the free version. Below there is a sample video of it.
For easier use it includes a Toolbar for the five operations availabel. Union, Substract, Intersect, Split and Cut.
You can download the Plugin at Sketchucation.