The Lord of the Rings by J.R.R. Tolkien
The Silmarillion by J.R.R. Tolkien
The Languages of Tolkien's Middle-earth by Ruth S. Noel
TheOneRing.net
Elven Phrases
Quenya-English Dictionary
English to Elvish
http://www.geocities.com/theringofdoom2/downloads/fonts.html
http://home.earthlink.net/~darrenv/tolkein.html
http://members.tripod.com/~gandalfelmago/fonts.html
The Unofficial Clannad Website
enya.com | The Official Enya Website
Loreena McKennitt Official Website
Official Lord of the Rings Soundtrack
Celtic music is also a good way to go.