Fly on the wall! The U.S. Defense Advanced Research Projects Agency is working to develop cyborg insects that carry spy equipment. To make the insects as inconspicuous as possible, miniaturized brain probes are inserted during the pupa stage. The idea is the ultra-light implants will naturally integrate into the body of the developing insect.
Create a DIY Spy Kit for a kid! Direct link to original post. Instructions are not very in depth, nor does she provide sources for some of the items in the kit, but it's a good starting point. Could also easily be called a "Kid's CSI Kit".
The Spycam Classic Lighter comes with a 4GB space and you could also film videos in 680×480 resolution. Since it has a USB plug, you could charge it that way. It is a great addition to the growing Spy Gadgets released and makes it very easy to join the fun.