To get a quick and easy macro shot, use two strobes and a white piece of paper to get a diffused light source. Strobist reader Neil Creek showed his methods on their discussion forums.
Here's the idea in a nutshell: Shoot straight down at your subject with two strobes placed on either side, aimed at one another. Next, place two strips of paper in semicircles around the object, creating an impromptu light box. This method is good for shooting relatively flat objects with texture because the light is directional and grazes across the surface, highlighting the texture of the object. Neil used this set up to create a stunning 225-megapixel panoramic macro image.