I modelled a quite difficult rock formation, which needed to be textured: http://sketchup.google.com/3dwarehouse/details?mid=d7801c562346005eb05fa4413d74cff0 I tried external applications that unfold the model and apply UV coordinates for the texture image. Unwrap3d (commercial, no export in free version) and Blender would have taken me to much time to learn and the first results were a chaos of vertices because the shape is to complex. So I used projected textures in Sketchup: 
1. Use View > Parallel Projection. Place rectangles in the air that are roughly parallel to each side of the model. Select each and click right > Align View and save the View as a new Scene.
2. Make Screenshots (Alt+Print) of each Scene, cut them and import them as new textures.
3. Optional: assigning colors to the boundary edges for each texture can be helpful.
4. Place the textures on the rectangles and adjust them untill they overlay perfectly the geometry behind (hidden geometry on is helpful). Then project the textures on the model.
5. Now you can use your graphics editor to lay photos over the outlines of the textures. You only have to consider that the textures are fitting along the red lines. You may have to distort/paint on them until the model is seamless textured. Reload the texture images in Sketchup several times untill you are satisfied.
Taking screenshots with parallel perspective is also practical when you have to merge several photos like for this large facade: 
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