Yes, they need sketchup to look at a .skp file. You can also export 2D images as .gif or .jpg files, and mail those, but they won't be able to move around in it. Or, you can export an animation as a .avi file. This will give them a 3D tour but still won't let them move around on their own. If you own the pro version, I think you can eport a .vrml file, which will let them move around using their web browser. CB.