Even if ur site is listed 2-3 times in different categories in dmoz i donnt think that it gives much benefit. It is almost same as having a single listing in dmoz. I have a website listed in 2 categories in dmoz and another one in a single categories. The SERPS are more or less same. What does u guys thinks???
I am with SiteTutor. DMOZ has some unique spots that give a very big advantage, it also has a lot of categories that are just almost useless as second place.