For those that aren't on the CFSFMExperimental Yahoo group, there is a new 
theory of CFS on the block. The author has been developing it for a couple 
of years or more and recently released the following to coincide with his 
attendance at a conference in the US:

http://phoenix-cfs.org/GSH%20Methylation%20Van%20Konynenburg.htm

I think it's the most comprehensive explanation yet and there is a treatment 
protocol derived from the Dr Yasko autism research. It's over on the 
aforementioned Yahoo Group 
(http://health.groups.yahoo.com/group/CFSFMExperimental/), entitled 
"Treatment of CFS based on glutathione depletion--methylation cycle block".

Regards
IanW