PDA Resources url
MedCalc (medical calculator) http://www.med-ia.ch/medcalc/
MedMath (medical calculator) http://smi-web.stanford.edu/people/pcheng/medmath/
MedRules: Clinical Prediction Rules for Palm OSŪ Handhelds.   http://pbrain.hypermart.net/medrules.html
MemoWare (free palm ebks) http://www.memoware.com/
PDA Resources ( UTHSCSA Library) http://www.library.uthscsa.edu/internet/pda.cfm?type=Category
PubMed on Tap http://archive.nlm.nih.gov/proj/pmot/pmot.php
WISER (Wireless Information System for Emergency Responders) 
http://wiser.nlm.nih.gov/
 
Book publishers also offer pda versions for certain titles