Made available by the OLPC group this heaping helping(>10GB!) of audio samples is free for download.
Loops, Grooves, Licks, Stings, Hits, Pads, Melodic Motives/Themes/Phrases, Sound-Effects, City and Country Soundscapes, Motors, Machines, Toys, Guns, Explosions, Swords, Armor, Cars, Jets, Pot & Pans, Acoustic and Synthetic Noises, Acoustic and Electronic Drums, Voices, Western and World Instruments, Real and Human Animals, Industrial and Natural Ambiences, Film and Game Foley, and more, more, more! This huge collection of new and original samples have been donated to Dr. Richard Boulanger @ cSounds.com specifically to support the OLPC developers, students, XO users, and computer and electronic musicians everywhere. They are FREE and are offered under a CC-BY license for downloading and use in your teaching, your demos, your research, your music, your remixes, your songs, your games, your videos, your slideshows, your websites, and your XO activities. Each of the 7000+ samples is 16-bit, WAV, Mono, normalized to -3dB, and provided at 3 sample rates – 44.1K, 22.5K and 16K.
The Freesound Project