This article is worth reading.
It looks at podcasting and talks about its uses in language teaching.

http://www.waoe.org/president/podcasting_article.html

Spoken Internet To Go: Popularization through Podcasting

by Steve McCarty
Professor, Osaka Jogakuin College, Japan
President, World Association for Online Education (WAOE)

The JALT CALL Journal, Volume 1 (2)
ISSN 1832-4215 (August 2005)
http://jaltcall.org/journal/contents_1_2.html
posted here by permission of the journal editor