The Journal of Thoracic Imaging published a review on using blogs for radiology education. Summer Sethi of Sumer's Radiology Site is the author of the article:
Blog/Web Log-A New Easy and Interactive Website Building Tool for a Non-net Savvy Radiologist. Sethi, Sumer K. Journal of Thoracic Imaging. 22(2):115-119, May 2007.
"The success of this project can be measured by the fact that in the last full year of "rad-blogging," more than 30,000 visitors came to the site from all over the world."
Summer is also the founder and frequent host of the monthly Radiology Grand Rounds.
Our own projects, ClinicalCases.org and the blog, have had more than 500,000 visitors and 1,500,000 page views since 2005.
One Million Page Views. Clinical Cases and Images - Blog, 2006.
Image source: Wikipedia, public domain.