The Whispering Library contains all known information about Nidlongdir.
The library's index is divided into the following topics;

The New Nidlongdir Blog starting 2009-07

Legends and Fairy Tales (old blogs from 2008-07-01 till 2009-06-30)

History

The Nidlongdir Word Encyclopaedia

The Nidlongdir Character Encyclopaedia