I firmly believe that EMS must reach beyond our own boundaries when securing information regrading healthcare and its changing landscape.  These are some of my sources.

Other Blogs:
The Incidental Economist
Skeptical Scalpel

Journals:
Prehospital Emergency Care 
BMJ Emergency Medicine Journal – some open access

Health Affairs – open access
Health Services Research Journal
Milbank Quarterly

JAMA
NEJM – some open access
BMJ Quality & Safety – some open access

General Healthcare News Sites:
Kaiser Family Foundation – open access
Fierce Healthcare – open access
Modern Healthcare – open access

EMS News & Magazines:
JEMS – open access
EMS World – open access
Emergency Management – open access
EMS 1 – open access