Several weeks ago, I put together a website called OpenGameArt.org, which is a community site that's intended to provide high quality, appropriately licensed art and sound for free and open-source game projects. While we have a growing archive, there's still a long way to go before we become the definitive FOSS game art resource.
As such, I'd like to ask that if you happen to have some art sitting on your hard drive that you think might be useful for a game developer (or you're an artist or musician looking for a way to give back to the FOSS community), please consider releasing some art under a compatible license and uploading it to the site.

Even if you don't have anything you'd like to contribute, feel free to stop by and take a look. I'm always interested in hearing any feature suggestions or comments regarding the usability of the site.
Thanks!
Bart