If you want nonlossy image formats, PNG. Most browsers can handle them. Should be able to handle them, they are the middle child of the Internet's standard protocals going back 8, 10 years.

I EDC my beat up, slightly scuzzy looking Memorex 256. I know thay have a bad rep, but mine never gave me a bit of trouble, and I like the ability to copy protect my stuff. I carry the basics for my job on it (site liscenced copy of Macafee, some printer drivers, stinger, etc), my contact information, and a scan of my living will. I don't figure that it will be looked at in the field, but it might be at the hospital. Particularly when everyone who is on the medical data/phone number card I carry in the wallet knows what is there. The back of the card also says "LIVING WILL ON USB DRIVE" in big block letters, incase they can't find anyone on the list. :P