Things are getting ever smaller. If you doubt this, just check out the Micro Camcorder - a spy camera developed by Spy Gadget. The camcorder has claimed the spot for the 'World's Smallest Camcorder'.
The camcorder is so small that it can be hidden in a chewing-gum pack. It's a one touch record function and records videos at 15 fps (frames per second). The captured video is stored on a flash microSD card. It has built-in batteries and charges via USB. The camera can record video for over 30 hours with a 1GB card installed. The price quoted for the taking is USD 295 (Rs.11,800).
I used it, Battery hardly lats for 2 to 3 hours.. but ofcourse ti will be more fun.. i brought it from some delhi based company (google with Indian surveillance camera as keywords)