Recently I have become a big fan of Podcasts. One of my favorites is The Word Nerds. It is described as "a weekly podcast about words, language, and why we say the things we do". Each week features a linguistic theme including related songs and "rude word of the week". This week's theme was Onomatopoeia. In addition to the usual discussion of etymology and usage they featured a survey of animal sounds from around the world. This is a great deal of fun and could consume a whole lot of time.
* Taken from the lyrics to a John Prine song.