The venerable medical journal The Lancet now offers an audio summary of its weekly content called "Listen to The Lancet."Feed:
http://podcast.thelancet.com/lancet.xml
This is the second member of the "Big Five" in medical publishing which starts podcasting (sort of). The NEJM was the first medical journal to embrace podcasting as a form of content distribution.
Downloadable audio files (podcasts) and text-to-speech programs are significant developments in medical education because they make it portable and truly on demand.
An additional health benefit is that you can exercise while educating yourself about the latest medical developments across the pond.
Update 11/11/2006:
The Lancet launched a blog in October 2006.
References:
Text-to-Speech Programs and Continuous Medical Education
Medical Podcasts: A Complete List
Updated: 08/18/2007