A couple months ago the Google hosting on that player started to become unstable, causing most of our streams to become broken. Thanks to a fix found by argentumlupine, I was able to upload a copy of the player to my website and offer it to anyone who'd like to use it.
I've also been talking to AO3, and they've done some coding on their end this morning, so now the code will work over there as well.
So, the new streaming code, for anyone interested is:
<embed type="application/x-shockwave-flash" flashvars="audioUrl=LINKTOMP3HERE" src="http://podfic.com/player/audio-pla
yer.swf" width="400" height="27" allowscriptaccess="never" allownetworking="internal"></embed>
With LINKTOMP3HERE changed to an actual link to the mp3.
Note: you need to have the podfic hosted somewhere that allows for streaming (many of the free upload sites do not allow this), but my offer to host podfics is still open to anyone. :)