Microsoft Research SenseCam is a camera that you "wear" and it automatically takes pictures of your environment depending on various conditions. It's kinda like having an automatic 365 a day photo project or digital diary of the days events but you don't have to worry about actually pushing the shutter button.
http://research.microsoft.com/en-us/um/cambridge/projects/sensecam/
Would you actually "wear" a camera? I used something similar on my dog once :^)