Blue clicky for Thomas's site:
http://www.pentatonika.net/

Something Thomas doesn't include: therapeutic uses of pentatonic scales. These are described (within the framework of traditional Islamic medicine) at the Tumata website - they have CDs for sale:

http://www.tumata.com/99ing_default.aspx
http://www.otagmusic.com/index.php?do=catalog/product&pid=6

One oddity is that Guvenc insists that pentatonic therapeutic music (like that CD, which sounds mostly like Central Asian folk tunes) should only be used with children. Most of his CDs are of seven-note scales, intended for adults with all sorts of medical conditions.