http://www.nikonchat.com/nikon-3100-reviews/

Stop comparing the Nikon D90 and D3100?
I'm buying my first digital SLR and have read the leaves of comparison in different websites of these two chambers. Both the D90 and D3100 cameras look great. I do not know enough about photography to really know the difference. The 3100 has more megapixels is lighter and is more recent. I can not understand why it is much cheaper than the D90? At Costco you can get the D90 body with two lenses, case, etc for $ 1279. D3100 body with two lenses, cases, etc. is about $ 729. Is it true that the D90 much better? Can you explain in simple terms why, because reading exams, etc. I do not see why.
The D90 is a camera D3100 stronger than good. The D3100 is an entry level camera. The D90 is replaced D7000 for new and both have many more features than the D3100. . If you spend some time in the Nikon website will soon see the differences between the three cameras
Canon 550D vs Nikon D3100