Let's say there is a device that identifies certain frequencies and their origin. Put one of them in the top of each light post (or at least one in three) and a camera. Then adjust this device to detect the noise of a gun shot. It will activate the camera aiming towards the noise source. It could help to identify criminal situations and will stop crime somehow, since they will know that can be viewed.

What about a new low cost terminal, something like the old Commodore 64 but with new features: keyboard with integrated screen (40x10 chars), no hard disk, instead flash memory (1 gig), serial port, USB port, internal modem and thermal printer... that's it. Programmable in Basic, C, Pascal or some other low level language. Lots of small merchants would like the idea of billing (for example) with this low cost terminals, and lots of programmer will have the opportunity of become in...