On Eenvoudige PDOK services plugin voor QGIS (in Dutch) Richard already described how to use the PDOK plugin to connect to webservices of the Dutch PDOK infrastructure. This infrastructure offers nationwide and publicly available WMS, WFS and some tiling services of Dutch governments.
This video http://www.youtube.com/watch?v=NjLG4KtpdYk shows how to use the plugin to create a map of some GML data on PDOK services in just a few minutes (including installation of the plugin).