Escape from Cubicle Nation have an interesting podcast interview with John Jantsch of Duct Tape Marketing, which is packed full of excellent marketing advice for small business start-ups:

John Jantsch of Duct Tape Marketing - http://www.escapefromcubiclenation.com/get_a_life_blog/2007/02/escape_podcast_.html

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Updated 2021 : note that the above post is out of date as it was originally published in 2007, but is left here for archival purposes. I have unlinked the external link as it is now dead.