Birding in Holland at www.jvanderw.nl
Groene Jonker (new wetland): fotoblog
Day trips: 25Mar2010 Amsterdam, 8May2010 Texel
Botshol marsh reserve S of Amsterdam:

- broedvogelverslag/ breeding bird report 2007 (pdf), 2008 (Word), 2009 (Word)
  (2 MB each, in Dutch, with English bird names, and maps, graphs)

- photos of scenery 17 May 2006: part A, part B, part C  (c. 7 MB each)

- photos of insects 7 May 2009
Tips:
www.dutchbirdalerts.nl - for the latest rarities
www.waarneming.nl - for all records
www.lauwersmeer.com - bird sightings at the Top of Holland
www.kastieltsje.nl - very nice bed&breakfast when birding along the North coast of Holland. Halfway between Texel and Lauwersmeer, close to Harlingen.
http://live.getij.nl/getij_locaties.cfm?taal=en - tidal predictions
http://live.getij.nl/getij_locaties.cfm?taal=nl - getijvoorspellingen
 
From the old days:

A 1250+ White Wagtail roost in Holland, 1966.

Summary of 'Rapid breeding bird colonisation of Floriade 1982 park Amsterdam'.

Waarnemingen van een opspuitterrein in Amsterdam-Zuidoost 1979-1985.