[thefonz78]

Yes it has scene mode it will not be much different. I would imagine it's essentially the same camera with a new sensor. You will get a better high iso performance from the newer camera that will be about it. The 2 sensors compared below.

http://www.dxomark.com/index.php/Cameras/Compare-Camera-Sensors/Compare-cameras-side-by-side/%28appareil1%29/664|0/%28brand%29/Nikon/%28appareil2%29/623|0/%28brand2%29/Nikon

http://snapsort.com/compare/Nikon_D3000-vs-Nikon_D3100

http://www.youtube.com/watch?v=bOgC9Gp1oaM