Gurfateh Jee,
Wicked post. You missed some major Sikh mulitmedia websites out under the 'Gurbani MP3 downloads' category.
http://www.sevatothemax.com/mp3s
http://www.g5sikhmedia.co.uk/audio.html
http://www.akj.org/skins/one/keertan.php
http://www.keertan.org/
http://keertan.panthic.net/
http://keertan.gurmatchanan.com/
http://www.sikhroots.com/
http://www.sikhsoul.com/
http://media.goldenkhajana.com/audio
http://www.sikhvibes.com/
http://www.gsghks.org.uk/kirtan.htm