http://www.cgtextures.com/
For me the best place for finding textures. I thought I'd like to share this place with you. It's an excellent ressource, maybe the best page at all!
Feel free to add other free texture pages.
I'm willing to allow others to work on the missing maps if the texture's quality is good overall!
For downloads see below.
Im working on some levels, I do not have an agenda, but lot's of time. So probably I will stick with this for some time. I do not have any intentions to create textures...
I've attached a screenshot. As you can see, the palm bark in the background has a black background whereas the barrel in the foreground is transparent.
Any suggestions? :(