Englishcaster features an index of English lesson podcasts. Only ten or so at the moment but this is an area which should grow. Also has useful FAQ on podcasting for those who are unfamiliar with this new trend. For an in-depth look at podcasting, read this BBC article.
WebCorp is the product of the Research and Development Unit for English Studies at the University of Central England in Birmingham. Like any Internet search facility, WebCorp allows you to view the entire Web as a body of text. However with its various filters and sorting options WebCorp goes far beyond the functionality that you would find in a typical search engine or newspaper archive search.
A simple search on WebCorp generates a list of examples called concordances from a selection of websites. These examples can then be sorted into a list where your search term is highlighted in red. The concordances are listed in alphabetical order according to the word that occurs to the left or right of your word. This gives you an instant picture of any grammatical patterns or collocation. WebCorp also provides a link to websites the words were taken from.
Learn one song a week with a downloadable MP3 file. If you miss a week or two, you can always catch up since the previous 3 podcasts are available. Just don't expect the latest Britney Spears or Coldplay. These are traditional English songs and nursery rhymes. More EFL/ESL podcasts can be found on the Internet TESL Journal site.