During our antibiotics teaching at medical school we were told that a recent survey of junior doctors had revealed that a significant proportion didn't realise that augmentin, tazocin, and carbopenems were penicillins and as such should not be given to those with known allergies. I devised a "mind-map" summarising the main antibiotics in use using information from the BNF and my own lecture notes. For me, seeing the information laid out in this manner, pinned above my desk as I work, helps me remember the major classes, their relationships with one another, and their major side-effects.
This poster offers a basic level of understanding of ABGs for medical students. I have also made an ID-card-sized version which can be easily used on the ward. Students can work around the table, looking at pH, then CO2 and then HCO3- and find the answer in the correct box.
This is a diagram I created to summarise the immune response, complete with friendly, loveable cartoon immune cells designed in an attempt to make what can be a very complicated and confusing subject seem a little less threatening. The students I taught the subject to loved the "cute" summary format and found immunology to be a much more approachable revision topic as a result!
Since this image has been so popular with all you lovely people, I have also written a comprehensive article on the immune response - complete with lots of illustrations - which is available here on Geeky Medics: http://geekymedics.com/2014/07/02/immune-response/
Enjoy and good luck!