This has been posted many times before, but for a great article, written for laymen, on the use of continuous regional anesthesia on the battlefield in Iraq, and the amazing results they have had with it, check out Silberman S. The Painful Truth. Wired Magazine. 2005 February;13(02). Available at http://www.wired.com/wired/archive/13.02/pain.html?pg=6.

And note to Karen: I just amended my last post (after Pete had captured it for his reply) to address the point on SIP that you had made earlier.