Some great blog posts about anesthesiology.
Jeff Steiner's fantastic medical student and resident centric website Anesthesia Made Easy as well as his free book on obtaining a residency position: Getting Into Anesthesiology
A teriffic, free, and well-written introduction to anesthesiology: Understanding Anesthesia by Karen Raymer
David Lyness' of Propofology high quality An Absolute Beginner's Guide to Anaesthetics
Free, well-produced textbook from U. Toronto: Anesthesia Clerkship Manual
The Society for Education in Anesthesia (SEA) Medical Student Guide to Anesthesiology