Ultra small digital cameras come in many different formats now including a wide variety of styles for various uses. Generally ultra small cameras give up resolution and image quality for stealth - but even this is starting to change.
Credit card size cameras, pen cams, camera phones and other odd little cameras are becoming more available with better quality and prices.
Check out these ultra small's. I have both of these on order, so check back for my personal reviews soon.
Compare these sizes and weights to the very small Fujifilm FinePix F550EXR 16 MP CMOS Digital Camera with Fujinon 15x Super Wide Angle Zoom Lens and GPS Geo-Tagging Function