KEXP Seattle is great. You can listen via Web here: http://kexp.org/.
They also play it for a few hours in the morning on 91.5 in the NYC area.
88.3 WBGO is a Newark jazz station http://www.wbgo.org/. Also great.
There is also Fordham Radio 90.7 http://www.wfuv.org/. Alternate Side at night plays chill, weird stuff.
Anyone else want to add a favorite?