I just read a very cool article by Alex Koloskov over at AKELstudio's “Atalanta Photographer Blog” about how he was able to get great macro detail on a small medical brush with clear bristles when shooting on a white background (for a catalog, I would guess).

Here's a little taste of what the final product looked like using his techniques (this is a 100% crop of the final photo, click for the full size version):

Head over to Alex's blog to see his lighting setup and read his tips on how to pull this off.