http://www.lotro-europe.com/
- The homepage. I'm sure everyone is familiar with this.

http://lotro-wiki.com/index.php/Main_Page
- Lotro-wiki. Really good basic knowledge base.

http://lotro.mmodb.com/
- MMODB. Especially useful quest information.

http://www.mehq.net/dynmap/index.php
- Dynamic map. Not fully up-to-date, still very useful when searching NPC's and other things like that.

http://lotro.allakhazam.com/db/map.html?area=0
- Mob mapping. Again not fully up-to-date, but helps with slayer deeds and that sort of stuff.

http://www.thebrasse.com/maps/LOTRO
- Beautiful hand drawn maps of smaller areas.

http://lotro-rares.bizhat.com/
- Really specific info of the rare crafting components. Not as vital since the introduction of the shards, but still.

http://lorebook.lotro.com/wiki/Lorebook_home
- Lorebook for item and recipe information.

http://www.lotrolinks.com/level45-quest.htm
- The level 45 class quest item info.

http://www.mmorpg.org.uk
A page for everykind of mmorpg games, propably the most useful part for LOTRO can be found at http://www.mmorpg.org.uk/showthread.php?t=3762
Very useful information about the books and pages for the legendary traits.


http://www.arda-online.com/news.php
Useful information in general and in more detailed.


http://lotro.mmodb.com/
The most used by Marlon. Not the best nor the largest, but quite handy and easy to use.

If you feel you need to familiarize yourself or perhaps refresh your knowlegde of the usual group fighting tactics in LOTRO, check out this thread:
http://forums.lotro.com/showthread.php?t=33692

There are some really good stuff on the yankee forum, especially the stickied threads are usually worth looking at. They take the research to almost a scientific level.

Info on the reputation system:
http://lorebook.lotro.com/wiki/Reputation_System

Is there any website where one can check exact LOTRO server population?

Here's my favorite look-up site for quest details. It is very thoroughly written and most (if not too!) detailed and contains maps with all required locations marked. I found almost every quest there by now and almost everything was correct, so to me it's a great site to query when I am stuck in a quest.

Here's the link:

http://www.lotroquests.com/

You can search it for NPC names, locations, quest names or whatever part of it, and it will show you what's stored for your request in their database.

Is there any external program that allows for viewing all ingame models? In WoW there was something called 'Model Viewer'.
I'm toying with an idea of resurrecting (in far future) a magazine me and my friends had (you can check it at www.azerothianweekly.com).
But, without such a program, it's a bit pointless.

I haven't come across anything like this. Very interesting idea though.

Shame, I'll keep searching. And Thopor - you've been playing on wrong servers There was a time we were quite popular, with Blizzard posting a link on their mainsite week after week... Good old times...

Do you know if there's any site where one can check LOTRO servers population?

Don't know if people are familiar with this, but was new to me. No server population info, but subscription info on several mmorpgs.

http://www.mmogchart.com/