Tyler Cowen asks,

Why don’t econ bloggers post their classroom and public lectures?

I already do. I add one or two per week. The latest one includes an interactive quiz.

I record them using an Olympus DS330 digital voice recorder. The files are very small in their proprietary format, but that format is otherwise user-hostile, so I convert the files to MP3’s, which tend to be 3 or 4 times larger.

For Discussion. Does anyone know of software that converts .wav to .mp3 files that produces really small .mp3 files?