Giardia - Giardia prevention and symptoms while backpacking and trekking across the world. Tips on the nasty bug. (http://giardiaclub.com )

Outdoor Action Guide to High Altitude - No matter what Timothy Leary said, there is such a thing as a bad high and this site lets you know all the excruciating details of climbing too high too fast. (http://www.princeton.edu/ align=oa/safety/altitude.html)

The High Altitude Guide - It's the guide to have if you're going to interesting but oxygen-deprived places.(http://www.high-altitude-medicine.com/)

Bibliography of High Altitude Medicine and Physiology - This list of references on high altitude physiology, mountain sickness, hypoxia, etc., has been compiled by Rob Roach, Charles Houston, Peter Hackett, and JP Richalet.(http://annie.cv.nrao.edu/habibqbe.htm)

Lonely Planet's Healthy Travel Guides - Guides that are packed with goodness and nutrition and look good too. (http://www.lonelyplanet.com/subwwway/)

CDC traveller's health-(http://www.cdc.gov/travel/index.htm)