How big of projects are you photographing? Once you get beyond a certain size, you might want to consider putting together a small light kit. If you use compact florescent bulbs, you can use wax paper, tracing paper, or sheer curtains to diffuse the light. You can also bounce light off white foam core.
Here's a video on making a small soft box. This person is using it for video production, but it works just as well for photography.