Forge Lessons: Series of Level Design Articles
Forge Lessons are series of articles about Halo 3 Level Design writen by Raymond Benefield. You'll find there a lot of advices and interesting notes about creating levels. It's an interesting read for every Level Designer. Check out the artice list.
Lighting in Level Design: Helping the Player to Navigate
Lighting in Level Design: Helping the Player to Navigate is an artice about basic methods on how to use light and shade to navigate player around the scene. You can find it at Take Interactive website.
Gameplay Analys: Batman – Arkham Asylum
Batman - Arkham Asylum gameplay broken to pieces and analyzed by Filip Coulianos. Check it here.
61 Ways To Better Design
Alex Galuzin from World of Level Design posted 61 Ways To Better Design Campaigns in Left4Dead. There's a lot of good points for any title you're working on. Check it here.
Art Dump from Singularity at Polycout
A lot of concept art from Singularity by Raven Software. All stuff can be found here.
How to Create a Playable Level in 11 Days
Check latest UDK Tutorials - How to Create a Playable Level in 11 Days posted on World of Level Design. You can read it here.
Creating Multiplayer Levels for Singularity
Creating Multiplayer Levels for Singularity - article written by Justin Dinges, Senior Artist from Raven Software. Read it here.
Full list from of articles from Singularity Developer's Diary can be found here.
Natural Selection 2 – Level creation process
Short piece of information about creation process on level Tram from Natural Selection 2. Check it here.
Battlefield: Bad Company 2 Production Focus
Short text about creation process of Battlefield: Bad Company 2 is available on CGSociety.
Article can be found here.