Links:

A1 Free Sound Effects - Audio downloads in WAV format. Different categories include, animal, people, weapons, weather, and cartoon.
A1 Sound Download - Downloads of MP3 stereo sounds to purchase. Also offers audio samples.
ButtonSound - Try music loop packs, drum loops, 3D soundscapes and background atmospheres.
F7 Sound and Vision - The Concept:FX series of CD-ROMs features 500 original, royalty-free sounds in AIFF and WAV formats.
Free Answering Machine Greetings - Recorded messages created by Jeffsounds for telephone and voice mail use. Also offers custom greeting creation.
HarmoniceMedia - Downloadable high quality original sound and music with previews.
Jem Studio Sample CD - Offering CD of kicks, snares, hits, strings, breaks, loops and synths sound effects.
ModernBeats - Downloadable modern hip-hop sounds, samples, and loops for all major software samplers; including HALion, EXS24, Kontakt, Battery, Reason NN-XT, SF2,and WAV.
NEO Sounds - Original sound and musical effects for multimedia production.
One Stop Beats - Offering sounds for music production.
Radioactive Noise - Cutting edge production sound library available for purchase.
SFX Gallery - Sound effects and music samples in WAV, AIFF and Shockwave audio.
Sonic Options - Sound design for multimedia. Listen to interactive button demos.
Sonomic - Provides access to a library of samples and sounds.
Sound Ideas - Royalty free professional sound effects and production music libraries.
Sound of the Web - Interactive sound libaries, other services include voice-overs, telehold systems and voice enabled internet sound development.
SoundFX - Sound effects libraries, music libraries, pro audio software and audio equipment.
SoundRangers - Sound effects and music downloadable in WAV and AIFF format. Custom sound design available.
SoundService - Sound effects and music loops downloadable in WAV, AIFF for Flash and multimedia.
Voice Presentations - Custom voice announcements sound effects for web site pages, banners and software development, audio library.
Womoma - Featuring soundfonts, WAV loops, multimedia, games, graphics, web design and Flash.