The National Archive, the Hague, providing all sorts of historical and genealogical information. This website is for a great part written in English, German, French, Spanish and Dutch. Most sources and historical information is in Dutch however, but all the main information - and that's quite much- is available in the language of your choice.
Persons, researchers who want professional help for historical and/or genealogical research, basic or extensive look-ups in (specialized)  libraries or archives should definitely visit the  'Dutch Archives historical research bureau'. This excellent, professional site is in Dutch and English. The leader of this bureau -situated in Leiden- is highly qualified: visit the site to get an idea!
To find all possible archives in the Netherlands the very complete website on archives from Eric Hennekam is listing almost all. The only thing is that the page loads pretty slowly: waiting though pays!
Another site which gives very good information about the Pilgrims, is the beautiful 'Pilgrim Archive '. This site is completely written in English. On this site there's also the possibility to search for summaries about the Pilgrims in the Leiden Municipal Archive.
And...Don't forget the wonderful source of old maps to be found at:
The Atlas of Mutual Heritage website

Complete list of all Dutch State Archives

Dutch Archives. Historical research bureau
Official list of abbreviations of all Dutch Archives and Archive-depots

The Dutch Rijksarchief dienst (State Archives Office) is made up of the Nationaal Archief (the former Algemeen Rijksarchief = Main State Archive) at the Hague and 11 more (state) archives divided over the other 11 Dutch provincial capitals

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• Alblasserwaard Genealgy Page (Zuid-Holland)