Sample Magic is a well-known sample provider with a superb quality of loops and samples on such genres as house, electro, dubstep, chillout and practically any genre there is in EDM. According to Computer Music, they are “one of the elite dance sample vendors” and I agree fully!
With that said, they are offering 18 free sample packs (620MB zipped) for you to download and use in your musical productions. In total, there are 680 samples ranging from drum loops to bass loops and single hit drum samples suitable for such styles as tech house, breakbeat, rave, minimal techno, chillout, etc etc.
I highly recommend downloading these packages to your sample collections.
EDIT 25/03/2013: due to bandwidth limits this sample pack isn’t available anymore.