Awesome packing tip called a skivvy roll. Teaches how to save space in your luggage every time you travel. Budget travel lovers will enjoy this technique because it can mean less packed luggage (and fewer fees).
medicalstate: A Brief Guide to Sutures. My current repertoire consists of the simple (over and inverted), subcuticular, horizontal mattress, vertical mattress, and lock-stitch sutures. This set of skills takes care of most problems.
In case you find yourself in an outdoor survival situation. Snares and traps- Everyone should know this and about the edible plants (and be able to make a positive ID of those plants if in doubt it's best not to use).