I've been eying on an SLR for a while to photo fast moving animals. I almost ordered a D90, but I read many consistent & duplicated issues with D90, some kind of lens connection problem, and many people are getting the same type of error messages.
HA ha ha ha ha ha ha ha ha ah ha ha ha.
Since the D90 is an entry level camera a lot of inexperience photographers are using the camera.
I read a lot of forums and haven't heard of a single recurring issue other than users who didn't read their manual and haven't a clue WTF they are doing and then bad mouth the camera because they are inept and don't know it's their fault and there is nothing wrong with the camera.
Maybe, I just read the wrong forums......NAH!

When you spend this kind of money, you expect the purchased item to function without issues. Thoese complaints by the D90 owners kept me holding on purchase, I just didn't want to pay for a possibly badly designed camera with a regreat afterward. The D300 doesn't seem to have consistent complains lately (after they had fixed some kid of screen issues a few years ago). I feel safe enough to get a D300 now. I generally bypass a first generation or early generation hardwares............