Don't forget the Aerospace Medical Association site at
Welcome to the Aerospace Medical Association- Aerospace Medical Association ; the Journal Online link can take you to some really superb research archives.
Also, the all-new 4th Edition of
Introduction to Aerospace Medicine (Stepaniak
et al) is now available. I have a copy myself and it's excellent reading! Previous editions are commonly referred to as "DeHart" after the previous editor (now retired).