In SolidWorks 2008 you should take advantage of the section views as it is very easy.
Once you press the section view button, you are taken into Section view options (in the left of your screen, replacing the Feature Tree). In this stage you must select a plane that will “slice” the model and the side that will be visible. The default is one of the 3 main planes (Top, Right, Front), but you can also select a user-defined plane. Alternatively, you can first select a plane and then hit the “Section view” button – in this case your selected plane will be the “slicer”.
You can move the slicing plane back and forth to check the model “hidden” features and also rotate it to get the exact cut that you need.
You can also perform multiple sections, using several (non-parallel) planes.