I thought this photo was of pollen. It's not. Really, those are the protrusions on a starfish at 66x magnification, captured on a dSLR.
Nikon Rumors reviewed the Nikon-compatible Fabre Photo EX DSLR Stereoscopic Microscope, a $1,600 lens that pwns macro photography pretty hard.
Here's a video they captured of a millipede. So gross, but we can't look away.
Two points Nikon Rumors makes: integrated LEDs sound handy for illuminating the small subjects, but they tend to create a harsh reflection on surfaces. And, yes, the microscope lens is every bit as "fun" as you'd imagine.
Lots more test shots over at: [Nikon Rumors]