I use a Nikon D40 + Sigma 105mm F2.8 macro (that doesn't auto focus with the D40) for the droplet shots, they are just plain drops into a colorful glass bowl.
@Payne, might want to visit Corbett some day, will plan a trip.
Payne: First three are my favorite. Color contrast in all three is just perfect.
ANP: Great Macro shots. I had posted similar drop shots before in this thread but your one is winner all the way.