Just so that noone will ever say “why didn’t you say so?”.
The Woordenboek der Nederlandse Taal (WNT) is on line and for free.
The claim that it is the world’s largest dictionary is probably a way of interpretation (there are 400.000 entries) but I guess it is fair to say it is in the same league as the OED, although it is not that strong on etymology.
Those interested need to get a free subscription at http://wnt.inl.nl/ .
Unfortunately, the interface is not very intuitive (so it is tuitive?) and everything is in Dutch. If anybody is interested anyway, I’m willing to give directions on how it works.