A little bit of back to the future...although discontinued, Polaroid produced a line of cameras called iZone which were an updated version of the classic Polaroid instant camera.
The cool feature of iZone was the film. The photo sizes were very small ,about 2" x 1" - the goal was fun, not fidelity. There were several different types of novelty film: one film had fortunes printed to go along with the photo. But my personal favorite is the sticker film, which has an adhesive back. This made it very well suited for field observations. You could take a quick photo, stick in in a note book, jot down your observation notes and then go on to the next observation (click on photo inset above). Even today with digital cameras there's no quick and easy way to combine photos and written notes in such a compact package.
Since the camera (and film) have been discontinued, they are a little hard to come by, but available through ebay and similar sources. However, most of the film is near or past expiration - but I am told, and can testify from personal experience, that the film works well past its expiration date.
We'll be using iZones and sticker film to capture observations at the upcoming IDSA Connecting '07 conference.