On the Mac, the templates are located inside the app (more traditional Mac install) in /Applications/Google\ SketchUp\ 8/LayOut.app/Contents/Resources/English.lproj/Templates. That way, when you throw away the app the templates and scrapbooks get cleaned up as well, plus if we chose to localize them, they'd be there in a per-language basis. All stuff we were working on years ago at Google, then went other directions. But hey, we're back now, working on new, good stuff for Trimble. -b

If you're new to layers, just be aware that they are not the same in SketchUp as they are in, say, AutoCAD...they don't separate geometry. They are generally only used for selective visibility/invisibilty of the kind that Csaba just described. The Golden Rule is to make sure that you actually draw everything on the default layer, then group it or make it a component before moving it to another layer. If you actually change your active layer from the default and start drawing on another one, you'll quickly end in a horrible mess with geometry all over the place...maybe faces on one layer and some or all of the edges defining those faces on another layer...then both of those grouped together and moved to a third layer. It can get very ugly very quickly