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

Nikon 3100 or Pentax Kx?
I have never done photography, but I decided that these are my options. What is best for a new person who wants to learn the office? want maximum image quality with minimal bells and whistles.
The Nikon D3100 has more accessories available, if you want to expand your system camera in the future, and also has a guide for beginners how to learn. Not sure about its image quality, however, uses a new sensor, so the image quality should be at least as good as the D5000, if not better. Wait and see.
Nikon D3100 Test! To Keep or Not to Keep.. part 1