AAMT (American Association for Medical Transcription) is now

AHDI (Association for Healthcare Documentation Integrity)

http://www.ahdionline.org/ 

Medical Study Stack

http://www.studystack.com/menu-14582

Google for Medical Transcriptionist

http://www.google.com/cse/home?cx=003427651722298574250%3Aptgl10o8ogw

Productivity Talk                                   **  This is a fantastic forum made up of MTs and techies with all kinds of tips and help on a whole bunch of subjects. There is also a Shorthand section (and for other expanders if you use them). You do have to register, but it is free** http://www.productivitytalk.com/index.php