Nightphotography for me means: ISO100, RAW, Custom WhiteBalance (yah i know raw allows me to takes care of it in postprocessing but i want to set WB manually with the help of a white paper), Aperture of 8, 11-16 and even 22 for a large depth of sharpness, and finally a shuttertime to match the above. I have ImageStabilizer turned off since i have had bad experiences with it on during long exposures on tripod.
Choose days when theres no moisture in the air since waterdrops on the lens can mess up things pretty bad, also choose days when it's not windy since it doesn't take much to make the image blurry. I usually shoot several pics of the same subject and save the sharpest one.
Heres the result of my workflow
[Edited 2005-01-03 05:01:07]