I've been asked many times about using Maven dependency management within NetBeans' ant projects. I've usually just simply pointed to the Maven Ant tasks page. As a result of recent email conversation I had, I've actually tried to setup a sample project myself.
With help of this NetBeans wiki page on Ivy it turned out to be fairly simple indeed. And while I was at it, I've added a new FAQ page to NetBeans wiki. It's a step-by-step tutorial with sample project attached. Enjoy!