The Department of Philosophy in Utrecht, where I work.
The publisher Ambo|Anthos, that publishes my Dutch books.
The very active and important network for Dutch philosophers: the Dutch Research School for Philosophy (OZSW).
The Dutch journal Filosofie & Praktijk, that I am an editor of. Two journals that I’ve been writing many articles for are Filosofie Magazine (a general magazine on philosophy) and Socialisme & Democratie (the journal of the Wiardi Beckman Stichting).
A lively debating site about social issues (I’m one of their ‘carriers’).
Some useful links in political philosophy:
A site with many useful links to classical texts in political philosophy.
The book site I am normally using (no delivery costs!) is Book Depository.