My first was a coolpix 990, I bought it at work. Used it some for equipment documentation, but also to document problems with electronics equipment, such as a bent pin on an IC or a bad solder joint. Though the low light performance was almost non-existent, the ability to photograph the pins on an IC was outstanding.
Then I bought a Coolpix 4500 for my own use. Same swivel body, and same great macro ability. I loved being able to stick the camera into a group of flowers to photograph a bee. I always loved this camera, wore the labels off some of the buttons, but a plastic tab inside broke off, and the zoom function quit working (July 08). Still very poor low light performance. It was a great match for me. When I go out hiking around shooting photos with my brother, he looks at the landscape and shoots that, I look at the moss or petals on a flower and shoot them. The coolpix was great for that.
When that died I bought a Sony DSC-H50. Optically not too bad for a point and shoot, but the worst camera to handle and operate I have ever used. Although I still have it, I never bought a second memory card or battery because I did not really consider the camera justified more expense.
Then this spring, influenced by this board, I bought the D90, and then shortly after, when that was in the shop for repair, a D300s for backup. I thought from the specs they were very similar. In my hands they are much different. The D300s does what I tell it to do. The D90 is like arguing with my wife.