sister netlabel of Tilt-Recordings:
www.tilt-recordings.com/t-free

incomplete list of free mp3 Drum & Bass netlabels:
www.abracadabra-recordings.ru/release.php?g=2
www.absysrec.com/free.htm
www.anxiety-disorder-recordings.com
www.archive.org/details/exegene
www.archive.org/details/techkilla
www.basswerk.de/basswerk/newshop/overview_bf.php
www.beataddiction.net
www.blackhoe-recordings.com
http://brutalattackrecords.npage.de
www.culture-assault.net/records/freecultass
www.cybercrunkrecords.info
www.darklandrecordings.com
www.darkstep.org
www.digibeatmusic.org
www.digitalgewitter.de
www.hmsu.net/releases
http://internetrecordings.org
www.konsum-productions.com
www.maximumbreaks.de
www.myspace.com/bfrecordings
www.myspace.com/fcktrxiii
www.myspace.com/fishrecordings
www.myspace.com/krytykalrecording
www.myspace.com/qubeatsrecords
www.mushcore-recordings.tk
www.nerverecordings.co.uk
www.plainaudio.com
www.royaljump.net
www.sublimerecs.co.uk
www.subvertcentral.com/scd
http://tamp3cords.com/free
www.tilt-recordings.com/t-free
www.zardonicrecs.ve.tc
...also see www.real-crew.com/n2/viewforum.php?f=30
and www.phlow.de/netlabels/index.php/Category:Drum_and_Bass
and generally http://b4.sonicsquirrel.net/links

more sources for legally free Drum & Bass tunes:
www.archive.org/search.php?query=zardonic
www.bbc.co.uk/1xtra/drumbass/dandbdownloads.shtml
www.breakbeatz.de/phpBB/viewtopic.php?t=10712
www.dogsonacid.com/showthread.php?threadid=442887
www.dogsonacid.com/showthread.php?threadid=476108
www.drumandbass.hu/icr/soulshine/index.htm
www.fanzinatra.com/19-02-2007/besando-el-tiempo-el-ep
www.offkeymp3.com/music.php (coming back soon, hopefully)
http://onsetaudio.com/category/free-downloads/
www.producer-network.de/forum/ftopic14696.html
www.producer-network.de/forum/mytracks.php
www.santorin.de/10years.php
www.shadowlawrecordings.com/forum/viewtopic.php?t=3777
www.simonv.de/music
http://starfrosch.ch/category/free-mp3-download/drumnbass/
www.tilt-recordings.com/media/free320/
www.turtledrec.net (offline)
www.zive.at/audio.php