7.4 Sample Resources

These are some pages where you can find samples for your projects. Remember that samples can be copyrighted. It is up to you to make sure that you can use the samples royalty-free in your projects.
The Freesound Project is a collaborative database of Creative Commons licensed sounds. Freesound focuses only on sound, not songs. This is what sets freesound apart from other splendid libraries like ccMixter.
Vocal & A-Capella samples - some of the singers request that you contact them first, if you plan on using their voices for commercial projects.
Free Sample Packs (registration required) gives links to many different sample packs, mostly royalty free.
Soundbible contains royalty free noises and sound FXs.
Hyperreal has a library of classic synth and drum synth sounds.
This article on Musicradar lists tens of links to sample packs with hundreds of sound each. All royalty free.