The community: http://forum.learnnavi.org/
Tseng a fko tsun pamrel sivi nìNa’vi Nì’aw aylahehu: http://forum.learnnavi.org/navi-niaw/
Where to go for the newest news about the language: http://forum.learnnavi.org/language-updates/
Taronyu’s Awesome Dictionary of Awesomeness: http://mwf-data.clonk2c.ch/dvi/attach/NaviDictionary.pdf
The most complete Na’vi grammar: http://en.wikibooks.org/wiki/Na%27vi
Prrton’s petition for the release of the language and other resources: http://masempul.org/
The post that started it all: http://languagelog.ldc.upenn.edu/nll/?p=1977