Lametta

A German unconventional and non-commercial radio show which is broadcast on Radio Antenne Muenster/Buergerfunk. The show is produced and presented by Jutta Hebbeler and Sergi Gvarjaladze.
http://www.muenster.org/lametta/

Star's End Ambient Radio

One of the longest running ambient/space music radio shows, started in 1976. Hosted by Chuck van Zyl and broadcast live weekly beginning at 1:00am on Saturday night until 6:00am Sunday morning (USA Eastern Time Zone) from WXPN, at the University of Pennsy
http://www.starsend.org/

Visionary Sound Arts Interface

Darv's linkfest to the major synthesists creating sounds that induce alternate states of awareness. Including annotated playlists for the radio show "Adventures in Consciousness."
http://www.geocities.com/darvkrizton/

Ultima Thule

A broadcast playing ambient and atmospheric music each Sunday from 10.30pm on 2MBS-FM 102.5 in Sydney, Australia.
http://www.ultima-thule.net/

Sound:Escape

An ambient and downtempo radio show broadcast online through RealPlayer.
http://1groove.com/show.php?s=soundescape

Natural VLF Radio

Recordings of the "music of the magnetosphere and space weather".
http://www.auroralchorus.com/