Hmmm.. I guess the usual suspects. Here's a few that I like to frequent. Any others?
Critical Care Medicine
NEJM
JAMA
Chest
Critical Care / Critical Care Forum
Pediatric Critical Care Medicine
*note: most of the anesthesiology journals have sections devoted to critical care topics, other journals by their very nature are critical care in content (e.g. Journal of Cardiothoracic and Vascular Anesthesia)
Anaesthesia (UK spelling)
British Journal of Anaesthesia
Anesthesiology
ASA Refresher Courses in Anesthesiology
(great for the basics such as ventilation strategies, transfusion, selective hypothermia, etc)
Anesthesia and Analgesia
Canadian Journal of Anesthesia
Journal of Cardiothoracic and Vascular Anesthesia
Journal of Trauma, Injury, Infection, and Critical Care