144 MP digital camera
 

http://www.betterlight.com/eModels.asp

How about 1000MP+ digital camera
 

http://www.gigapxl.org/

There's a thread on it here. Actually the camera is now up to over 4GP.

Scanning backs have been around for a while. Their most common application is to shoot flat art work for high-detail reproduction. Their drawback, aside from cost, is their relatively slow speed. Although some photographers have taken them into the field for landscape work these rigs are basically at their best in highly controlled studio conditions...not something you'll use to shoot the family at Christmas.

I'll take two ;=)

We had one in school. It was a real PITA to use. The school only had 650 watt hot lights and you couldn't check out enough of them to get a decent f-stop. It also took about 2 minutes to make the exposure and if anything moved the least little bit during that time the picture was ruined.