Loops.NET :
USA based comprehensive listings of music sites, including looping software and sound samples.

BreakBeatsOnly.COM :
UK based sound samples and loops covering various genres including drum and bass.

LoopAsonic.COM :
UK based free downloadable sound samples and drum loops covering various genres.

Paranooyer :
Netherlands based with links to sites containing sound samples and audio tools.

SoundCavern :
France based with links to music sites.

BreakBeatZone :
Russian based with audio streams and DJ mixes and sound samples.

HQSamples :
Russian based with DJ mixes including links to acapella sites.

FruityLoops :
USA based Looping software with tutorials and links to sound sample sites.

RiotAct.COM :
USA based royalty free music with links to other sound sample sites.