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With great startup scene, I mean there are bunch of cool startups within biking distance of each other (To name just a few http://www2.layar.com/, http://www.phusion.nl/, http://www.ebuddy.com/, http://www.supersaas.com/, http://www.guerrilla-games.com/). So you're bound to run into fellow entrepreneurs.

It also has a large number of headquarters of multinationals (Cisco, Philips, etc) so expat services are well developed.

I'm not really into generally accessible meetups myself, but I'm sure I've seen a few announcements come by of various functions.

There's STIKK (http://www.stikk.nl), and a bunch of Ruby/Python/Haskell/JavaScript meetups. What's maybe lacking are a couple of big companies that buy/invest in smaller ones (e.g., like Nokia in Berlin).

Regarding meetups I have been wanting to organize one for sometime, but I'm going on holiday for a couple of weeks, so I will think about it when I will come back.

Let's not forget the very talented folks at Sofa : http://www.madebysofa.com/

Layar is from Amsterdam