Quake3World

So, which editing community sites do you like to go to?

Except Quake3world ofcourse :P

Because most other sites I'm familiar with, seem to lack activity.

I like levelmakers.com.

http://www.doom3world.org
http://www.splashdamage.com

You didn't specify level design in the title, so I'm cheating. Maybe change the title to level-design or inspirational sites?

Here are some sites with pics that may provide good level-design inspiration; some of these are damn cool...

Chernobyl Pictures

Dark Roasted Blend (check out the dangerous roads and abandoned places features on the sidebar)

Grubenarchäologischen Gesellschaft

Gunkanjima

Curious Expeditions

Abandoned But Not Forgotten

Lost Cities

Neverends

Tokyo Sewers

Sleepy City

Urban Exploration

Urban Ruins

The Vanishing Point

Zahkunst

Cheater

Those are some excellent sites you listed, they will come in handy!

But to clarify, I'm refering to editing/design communities. I changed the title of the topic. Thanks for the suggestion.

I came across this yesterday:

http://www.cgsociety.org/

The links are not really level design related but more towards modelling and textures for games
http://polycount.com
http://cgtalk.com (same stuff as cgsociety)

You can also check out KatsBits, a site by... well... you-know-who:
http://www.katsbits.com/cgi-bin/ikonboard.cgi

Don't forget Cranky Mappers United!