Bronto Scorpio Music has released Free Glitches, Vol 1 - a free sample pack.
Here's what they have to say about it:
Don't expect pseudo analog stuff here! You get 120 weird, digital noises with this pack! These sounds are perfect for Autechre, Richard Devine, Aphex Twin like tracks, but can also add some special elements to other tracks.
I designed these sounds over the last few months and thought it would be cool to share them with you. The pack contains 120 24Bit/44Khz wave files and a simple Kontakt (3.5 or higher) instrument where the samples are mapped across the keyboard. Mod- and pitchwheel do some crazy things in this instrument too!