Wikipedia is probably as good an introduction as any: http://en.wikipedia.org/wiki/Cloth_diaper#Debate
Also, cloth diapers cause more rashes. (Unless there is an allergy to the disposable one, in which case it causes more.)
I'd heard the contrary (we use both cloth and compostable disposables), any citations?
I can see how those using strong washing detergents could have problems, we use ecover and haven't had nappy rash problems (anecdotal I know).
Wikipedia is probably as good an introduction as any: http://en.wikipedia.org/wiki/Cloth_diaper#Debate
Also, cloth diapers cause more rashes. (Unless there is an allergy to the disposable one, in which case it causes more.)