Here are two excellent websites for more information on LDN. Both include details on exactly how LDN works, and links to research studies on its use (of course, there have been no studies yet on LDN and ME/CFS!) LDNers
LDN Science (check out the video on the homepage that shows how LDN works)
Also, a pharmaceutical company has purchased the patent for LDN (at 4.5 mg) and has applied for FDA approval. Since this is a different dose of a drug already on the market for decades (naltrexone at 50 mg), approval should come quickly. Then, LDN will be available through any drugstore rather than having to go through a compounding pharmacy. This will make the treatment far more appealing to mainstream doctors, and the company has pledged to keep the cost reasonable (at less than a dollar a day).