Journal of Medical Internet Research

http://www.jmir.org/index
One of the leading journals focusing on medical informatics. Published quarterly in PDF format, its publications are also available in HTML format for free. Articles related to the achievements of medical informatics, as well as to research results concerning Internet technologies applied in medicine for research, educational or medical purposes (eHEALTH) are published here

Journal of Telemedicine and Telecare

http://jtt.rsmjournals.com/
The most widely known journal focusing on e-health and telemedicine. Its articles are available on the Internet for subscription.