I can't believe nobody's mentioned Quick Mask! I rough out selections either with the lasso or with colors or channels. Then I go into Quick Mask mode - which allows you to paint a mask on your image as gromit suggests, without having to create a mask layer, etc. Rough your selection. Enter Quick Mask mode by clicking the right hand mask button under the color selection tools in the pallette (over the window/fullscreen buttons). Then use paint tools and eraser tools to add or subtract to your mask (which by default appears as a red "gel" over your image). Click the left-hand mask button to exit Quick Mask and see your selection as "marching ants" again. You can then save your selection, float it and make a new layer, invert it and delete the background, or whatever. I rarely make a selection without it. -sk