I have a lot of the information regarding illnesses and basic things like safe food lists printed off from the HRS website.
On top of that, I also keep a section for each of my bunnies where Irecord everything in it. I have a section for illnesses/mites where Irecord any signs of an illness (such as going off food, etc.) and thedate. I also have a vet visit page where I record when I took them tothe vet and what was done. I have a general area where I just writelittle things on what he gets fed, what he likes, etc. for other peoplewho watch him. And last but by no means least, I have a weight table. Irecord their weights monthly so I can keep tabs on their health.
That is very helpful to have when problems reoccur or for earlydetection of ilnesses and should be a part of every bunny binder.