This video is called 30,000-strong flock of Barnacle Geese, Netherlands, February 2010.
On 21 August, I reported about a new Internet site with data about rare birds in the Netherlands, ever since 1800.
Meanwhile that new site is working.
It is here. It is called Dutch Avifauna.
Many things on the site are not working yet (including the English language parts which I expect will be working soon).
Officially, the site will start on 25 August.
See also here.