Here is some "sound advice" regarding some unique sounds links:

http://flashkit.com/soundfx/
Flash Kit has an ever growing list of shareware and freeware SoundFX for download. It provides a powerful searching, excellent organisation and easy real time  previews make this the most advanced Sound FX download site on the net!  mp3 and flashtrak versions of all effects as well!

http://www.audiomicro.com/royalty-free-sound-effects.html
AudioMicro is a revolutionary collection of user-generated micro stock  music, sound effects, production music, production elements and music  cues. Finally, high quality audio content is available at unbelievable  prices with no hidden costs or fees.

http://www.sound-effect.com/
Search for, preview and download royalty free sound effects for immediate use in your multimedia project. These high quality royalty free sound effects are hand-picked from only the best sound designers

http://www.soundsnap.com/browse
Soundsnap is the best platform to find and share free sound effects and  loops- legally. It is a collection of original sounds made or recorded  by its users, and not songs or sound FX found on commercial libraries  or sample CD


http://www.findsounds.com/
FindSounds.com is a free site for finding sound effects and musical instrument samples on the Web. It is a Web search engine, like Google and AltaVista, but with a focus on sounds. It provides powerful features, yet is simple and easy to use, and suitable for all ages

http://soungle.com/
Soungle is a free site, developed by Southern Codes, for finding all  kind of sound FX and musical instruments samples on our mega online  library. As different from most of similar sites, Soungle is NOT a Web  search engine. It only searches in our growing monster database. Our  goals are to keep it simple to use (search, preview and download) and  to keep it free

http://www.sfxsource.com/Sound-Effects
In SFX Source youll find cutting-edge and imaginative sound samples crafted with  passionate expertise for use in all levels of production, from  professional to amateur, for use in Film, TV, Games, and New Media.


http://www.a1freesoundeffects.com/
A1 Free Sound Effects wants to provide the internet with our Free Sound Effects that you can download to your computer and use for church, school, home or for any non-profit project. Commercial Sounds Available.


http://soundrangers.com/html/free-sound-effects.html
Soundrangers specializes in generating state-of-the-art royalty free  sound effects and music for interactive media, such as virtual  user-interfaces, games, online entertainment, web sites and  communication devices.

http://www.partnersinrhyme.com/pir/PIRsfx.shtml
Partners In Rhyme provide free  resources, help and advice to amateur and professional multimedia  producers, film makers, musicians and students in their search for  music, sound effects and audio tools to complete their projects  inexpensively and quickly

http://www.soundboard.com/
Soundboard.com puts all your audio clips, as well as millions from other users in one, easy to manage location.  Its mission is to invite everyone to help us create a central site for audio clips in a format that anyone with a connection and a browser can enjoy

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http://Gpro.ws
http://DatR.ws (Store, Sync, Share, Publish)