Psychopharmacology Tips (by Dr. Bob)
Contains articles about the issues surrounding the subjects, not just bald "facts". Good search facilities and very informative. (recommended by Antonia)
Drug InfoNet
General drugs information. One of the biggest pharmacology sites suitable for the layman.
Secretin and Autism (from The National Autistic Society (UK))
A reasonable, balanced account, albeit it could be accused of sitting on the fence. (recommended by Mike Stanton)
The Use of Secretin for the treatment of Autism The Autism Research Unit (Sunderland, UK)
Paul Shattock's site is open-minded on the subject, but sympathetically cautious. There is a bit more science on this site than the NAS one. (recommended by Mike Stanton)