i recently purchased a cannon rebel xti, i love the camera. However, lately i have been trying to take some skyline shots of the city at night, i either get a dark picture with little specs of light or a big blur of lights, does anyone know the best way to take a picture like this?

Have a look at my tutorial here:-

http://www.geofflawrence.com/photography_tutorial_photographing_buildings-2.php

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http://www.geofflawrence.com

I would suggest you use a tripod and set the iso to 400.