Oh there would be plenty of uses.
Oristar, well if you're talking about ultrasound cameras, then yes, in fact the world's smallest are smaller than a grain of rice, and they're used to scan the insides of coronary arteries, etc.
But if you're talking about light-based imaging, it may be possible but there's nothing like that available on the market right now.
Here's the world's smallest one million pixel camera phone module (6 months ago):
www.3g.co.uk/PR/Sept2003/5782.htm