A link that provides PDA software "sharing" for military personnel.
There is a fresh link to receive a FREE PDA version of the SF Medic Handbook currently on this site. You must join apply for membership before you can get to the forum.
I am a member, and it seems to be a very good site for PDA users. It also has a lot of good links for free pharmacology and general medical info.
http://groups.yahoo.com/group/Operational_PDAs/