I recently bought D5000 after trying D60 and D90. The live view funtion is really helpful if I want to take macro shots of insects or animals or flowers. I find it easier to see the grid and controls on a screen rather than looking to the camera.
Though I still think D5000 is not a starter camera. It is a bit advanced. However I love the video quality.
D90 has live view as well as video. What did you find better in D5000 compared to D90 ??