Well, I blogged Genesis One in Quenya already...
So here is the Lord's Prayer in Sindarin...

Ádarem egor aerlinn na-Eru Phainadar

Ádarem i ne menel,
aer ess lîn aen,
árdh lîn tolo,
iest lîn aen ne menel a ned amar.
Si anno i mast vîn órui ammen
ah ammen aranno raegath vîn
be arannam an raegdain vîn,
ah ú-dogo na-vael ammen
dan leithio ammen ed ulug!
Amen.

This wonderful translation was done by Ryszard Derdzinski. I found it at
Gwaith-i-Phethdain .