["The green book"](http://en.wikipedia.org/wiki/Dutch_Language_Union) is the official grammar reference for the Dutch language. The publishers of the green book [are now providing help to users about new grammar and spelling rules over Skype](http://www.nu.nl/news/607542/50/Makers_'Groene_Boekje'_leggen_spelling_uit_via_Skype.html). Search for "groeneboekje" on Skype and you'll see the related users indeed exist. (Thanks to Hans from [Skypeteer](http://www.skypeteer.com/) for pointing this out.)