Sketches I've seen recently that prompted this post: Austin Kleon's Sketchbook, Urban Sketchers, Nathan Fowkes' Land Sketch

Whether it's in my notebook or DS Light, every project starts with a sketch. For me, sketching quickly reveals what will work visually and conceptually more than if I jumped right onto a computer. A by-product of sketching, it's nice to have a physical diary of projects that I have worked on over the years. It's a luxury to flip through quickly and see what the "ah-ha" moments were 2, 3 or 6 years ago.