My favorite NPR program "This American Life" has made the move from awful real audio to mp3. This is good and bad. It's good because mp3 works more places, it's bad because it breaks my greasemonkey userscript. Here is a workaround:
Right click on the link-> save as.I'll fix the script in a bit and it will be automatic, but this should be a stopgap till I get it done.
Change the file extention from .m3u to .txt.
Open the txt file. In it you will see a url. That is the url to the mp3.