Several Shockwave Radio Theater programs are available in several formats, listed on the David E Romm Bookmark page. Aside from the few mp3 files from last year, all the files started out as .aif and the archive.org software did the rest. Click on a show to see all the formats. Either stream will work well on your computer, the VBR (Variable Bit Rate) is probably best if you want to load it into your iPod, and the Ogg Vorbis is an open source standard and .m3u is apparently for Windows Media, or somesuch.
Bookmark the bookmark page: More shows will be added, and I'll slowly take down mp3 files from my site while adding Shockwave Radio Podcasts with pictures and urls and such.
As always, corrections are encouraged and please tell me if something doesn't work. If you like a show, please leave a comment on the archive.org page!