PostNL is the biggest Dutch package carrier(formal TNT post).
Website for tracking: http://https://tracktrace.postnlpakketten.nl/search/searchbasic.aspx?b=TRACKINGNO&p=POSTALCODE&lang=en
I like to see this happen, because I like PackageTrackr because you have a simple 'all in one' tracking system.
Also when using the url, TRACKINGNO = Tracking number, always starting with 3S or 2S. If not starting with 3S/2S the tracking is invaild. POSTALCODE = Postcode, like 9999ZZ. Just like ZIP codes in the US.

Would be great if this can be realized!
Vote if you are with me :)