Topical yohimbine is definitely capable of producing localized fat loss as long as your carbs aren't too high and you are in a caloric deficit...that is, topical Yo won't burn fat by itself. You have to already be burning fat with your diet and other supplementation for the fat in those areas to be lost.
Another good product which I think is superior to Yohimburn is Avant Labs' Lipoderm-Y. Par has pretty much destroyed macrophage in the Yohimburn vs Lipoderm debates. It's a little cheaper, too.
Of course, you can also go to
www.anabolicminds.com and read the sticky on making your own transdermal yohimbine
I have a feeling that enkai got some of his info here, and if so, it's a very good source.