Before we continue further with this thread, it is best that the TS be a little more detailed and specific in his/her requirements as this thread will definitely get bashed based on the replies I have seen so far.

Since if statistic is what TS might want to know you can check out Flickr's stats on camera usage.

Nikon Cameras
http://www.flickr.com/cameras/nikon/

Canon Cameras
http://www.flickr.com/cameras/canon/

Sony
http://www.flickr.com/cameras/sony/

Panasonic
http://www.flickr.com/cameras/panasonic/

Fujifilm
http://www.flickr.com/cameras/fujifilm/

Olympus
http://www.flickr.com/cameras/olympus/

Pentax
http://www.flickr.com/cameras/pentax/

By the way, these stats don't mean squat