hey great thread!
i can't say that i have an all time favorite.. but for a long time i fell completely in love with Abacus - California Sunshine.
also, the violin in Swivel Pigeon - Swarigami from Ambient Meditation 3, is painfully nostalgic.
aaand Katoo - place 8
aaand Dub Trees - Liquid Dub (if only it was a little longer..)
aaand now i'll stop. (btw The Kumba Mela Experiment - That which i could only sense, is beeeeautiful)