I did this for the stackoverflow podcast.

Ensure your sound devices are setup with alsamixer -V capture.

Record with arecord -vv -fdat stackoverflow.wav.

Ensure the WAV file is less than 90 seconds with good old sox with sox stackoverflow.wav -e stat.

Playback like aplay stackoverflow.wav

Encode to MP3 with lame stackoverflow.wav from Debian Multimedia. Or with the better free codec OGG with oggenc stackoverflow.wav.

You'll want to do this to save space:

x61:~% ll stackoverflow.*
-rw-r--r-- 1 hendry hendry 1.6M 2008-04-19 18:18 stackoverflow.ogg
-rw-r--r-- 1 hendry hendry  25M 2008-04-19 17:58 stackoverflow.wav
-rw-r--r-- 1 hendry hendry 2.1M 2008-04-19 18:13 stackoverflow.wav.mp3
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