search engines:
www.dnb-sets.de (DJ-Sets search engine)

manuals:
www.awxcnx.de/handbuch.htm (web privacy)
www.rapcointelpro.com (labels, releases: HipHop perspective)
www.selfhtml.org (HTML manuals)

databases:
www.dancehallmusic.de/riddimbase.php (Reggae/Dancehall database)
www.discogs.com (general music database)
www.magnetbox.com/riaa (RIAA radar)
www.rolldabeats.com (Drum & Bass database)