I have a Nikon D50 and I love it. I need a better lense though. Saving $$$!
The D90 is a really nice camera. 3 of my coworkers just bought it. They had a special where it came with the 18-105 for about $1400. I'm not sure where they all bought it from, though.
I have a Rebel XTi....I really kind of want an XSi but I can't justify it since my XTi is only a year old. I really like it, though.