I'll try to have a look when it comes on to see what they use. I don't have an answer right now (Looks like they use flash to play back archives, at least to me) but I shall try. I am doin' server movin' at the same time so don't be surprised if I don't answer until tomorrow (I may find the reason (or not) but be unable to get to it until later). Hopefully the Rayman is right and it is all moot. 😛
Okay, I'm able to hear it just fine. I see the thing playing through a small Flash applet at the right.
The way I got on:
-Started at http://www.blogtalkradio.com/TMF-Radio
-Clicked on the orange "click to listen" button
-A new window opened
-In that new window there was a small Flash applet in the upper right started to work and began playing