Prader-Willi at Yahoo Groups is a general purpose mailing list. The archives are publically available.
PWSA-USA-0-5yr at Yahoo Groups is targeted for parents of younger children. Moderators need to approve new members, who can then post and view the archives.
Asociación Madrileńa para el Síndrome de Prader-Willi Forum at the Madrid PW Assn. General Forum in Spanish. No registration needed.
PositivelyPWS Yahoo mail group. Said to discuss alternative ideas/therapies/treatments....