Is there an online catalog for dutch coins?

Answer 1

http://members.chello.nl/~r.tholen/MUNTCATALOGUS.htm
http://www.nomisma.nl/ (select catalogus at the left.)
http://www.muntencatalogus.com/

And the google results page, might not work, in that case, enter munten catalogus into Google:
http://www.google.co.uk/search?hl=en&q=munten+catalogus&meta=