Bitmap font:

http://commons.wikimedia.org/wiki/File:GNU_unifont.png

Pretty much covers all living languages.  Released as GFDL and CC-BY-SA.

Note: if you're using this in a game, that's a pretty big image to keep in memory.  You might use the raw GNU Unifont format and draw individual pixels instead of blitting images.

Not sure if this was posted before:

http://www.openfootage.net/

Creative Commons sounds (not music)

http://www.freesound.org/

blender stuff:

http://www.blendswap.com/ (all CC-0, CC-by or CC-by-sa)

http://e2-productions.com/repository/index.php (not sure about license stuff here, "free for beginners"..)

Musopen: Public Domain Orchestral recordings http://www.musopen.com/music.php

The OLPC people made a huge resource of sound samples which could also be looked at. http://wiki.laptop.org/go/Sound_samples

I wanted to see if somebody can check out the sounds and see if they are good for any use or not. It would be interesting to see opinions on this repo.

The OLPC sounds are fine for re-use, I can remember seeing a few projects using them, can't remember which though :)

All these assets were created for the commercial MMORPG Ryzom. They are all free to use under Creative Commons License Attribution-Share Alike 3.0 license.

You can also download the archive from Source Forge or from torrent (1.4GB). This archive contains all the assets of this website.

http://media.ryzom.com/

Just found this one: http://www.derekyu.com/tigs/assemblee/ There is some very good as well as very bad stuff in there :) All kinds of 2D and 3D art.

This might interest you:

http://sounds.beachware.com/ sounds are free for non-commercial use - Lots of them

http://incompetech.com/m/c/royalty-free/ Royalty free music

http://www.jimmyg.us/ Music, not sure which license, but good stuff

All of your links have a trailing space which makes clicking on them lead to a 404 page.

Anyways, your last link states in the 2nd question of his FAQ that "Title www.jimmygelhaar.com Licensed under Creative Commons 'Attribution 3.0' http://creativecommons.org/licenses/by/3.0/".

Interestingly enough, in the same FAQ he asks you to purchase a commercial license if you make money with one of the songs.

Edit: The site is great resource, thanks :-)

Found something on my travels, although don't know if it would come under art resources though :-

http://aterribleidea.com/2010/12/06/a-glimpse-at-some-terrible-character-portraits/#comments

the user sunburn has posted those two links in the IRC, I only add them here for the sake of archiving and sharing:

http://www.highresolutiontextures.com/

http://www.texturelovers.com/

Both state the license is "Creative Commons Attribution 3.0 Unported License", though the second one has that strange statement in their FAQ saying "IMPORTANT NOTE: You are forbidden to package and sell these textures." which indicates that either me or they have no idea what CC-BY is all about.

Ok sorry if I sound a little bossy(I dont know cant think of the word) but that bitmap font allmost certaintly doesnt cover nearly all living languages for 1 simple reason approximently 2thousand languages probably more are oral not written (and very much alive) 

some language related links

http://www.ethnologue.com/ (Basicly a language dictionary)

http://www.wycliffe.org/ (an organisation dedicated to translating the bible into every languge)

yes that last one is christian dont click on it if you dont want to i'm only linking it because one of their jobs is creating alphabets for those 2,000 previously metioned

you were most likely reffering to trade languages if you were you are completely correct

I only say this because languages are an important subject to me

http://openclipart.org

But I guess everyone already knows it.