Here are some useful links!

http://lorebook.lotro.com/wiki/Lorebook_home
Official lorebook

http://mehq.net/dynmap/index.php?lang=en
An incredibly useful dynamic map that should be very helpful!

http://www.arda-online.com/map/
Another map, using google map

http://lorebook.lotro.com/wiki/Release_Notes_Book_14_Official
Release notes for the upcoming book 14 patch.
These are for the version released on the preview server only, so they might change!

http://www.lotro-wiki.com
Helpful wiki-page about Lotro

http://lotro.tentonhammer.com/index.php?meid=6
A helpful site on quests and everything else

http://www.lotro-wiki.com/index.php/Carn_Dum
Info on raid instances and mobs in there

http://www.lotroalliance.com/recipes.php
Info on mats and what you need them for/recipes

http://www.northshield.co.uk/LOTRO/Armour.htm
Crafting guide on armour sets

http://lotro.mmodb.com/
LOTRO database, VERY useful!

http://lotro.allakhazam.com/
Another popular database!

http://www.ventrilo.com
Download Ventrilo

Thanks to Engnysis for providing some very cool links!