Here's a showcase of my best macro shots from last year. Used a Tamron 90mm f/2.8 macro lens on an EOS 350D for all of them. I couldn't have got any of these shots without the external flash that I used to light the subject. I had the Tamron lens with me for quite a while before I got satisfying pictures with it. Without the extra light from the flash, I couldn't stop down the lens to f/11 or f/16 to get the depth field required to keep the interesting elements in focus. If you are getting into macro photography (especially moving subjects like insects), you should learn about off camera flash photography. The
Strobist Blog is one of the best resources on the net for that.
The biggest difficulty was finding someone to hold the light for me, or in some cases shooting single handed. That involved manual focussing by moving the camera since I would be holding the flash with the other hand. I have since got a
flash bracket with a flexible arm to take care of the flash, but my priorities have changed. Now I don't get any time to chase bugs between the nappy changes :)