I think I have it back up. A new flash card for RaspPi B, write image using physdiskwrite. (GUI didn't work -- used command line OK.) Then follow instructions here:http://www.t3node.com/blog/live-streaming-mp3-audio-with-darkice-and-icecast2-on-raspberry-pi/
My audio input is a behringer UCA-222 (~US$30), which shows up as hw:1,0 for the darkice config file.
I should really duplicate that flash card and tape it to the bottom of the RaspPi case so that I have a spare. My UPS held out for two hours, but the RaspPi crashed and ate the flash card because I don't have it set up for a graceful shutdown. (NUT for RP?)