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If you are looking for a PPC solution I'm not sure if there is one. Generally there's OV, Google, Espotting, then Qualigo - perhaps our dutch members know some second or third tier solution.
There's a few free resources that have dutch info, if you restrict your searching: Searchhippo xml feed (with search against .nl only), DMOZ directory dumps (netherlands categories only), and google API (with search against .nl/or/dutch language only)
Havn't found any PPC stuff yet...
wotbot has only got about 350,000 dutch sites (http://www.wotbot.com/search?q=country:nl) but you can get you a feed with queries limited to those.
its a bit more advanced than just using .nl domains, it will also include generic domains where the server is hosted in the Netherlands.