maven

I switched from ant to maven quite a while ago and after sorting out some quirks and problems it is working nicely.
One thing that's immediately evident ist - as soon as you use maven your requirements change - as there are so many possibilities - like generating project documentation, code metrics and so on.
There are also so many interesting plugins/mojos available that soon you will like and use.
The maven integration in netbeans(6.8) is also great and even superior to the ant project system in my opinion because of the higher feature set which is provided by maven out of the box.
There are definitly things to sort out when using maven - and it is far from perfect but i think it offers a nice standardized way to organize and build projects with the possibilty to add plugins easily.