I have a Canon T1I and love it. I still got lots to learn so I am not currently using it to the full extend but I'll get around to reading the manual some day.
This probably won't affect most of you but the Canons would be preferably if you are interested in astronomy and photographing the night sky since the noise eliminator on the Nikons will eliminate the smaller stars (according to last year's Astronomy article on the current cameras available). lol