Some interesting ways to capture night shots:
Please see http://picasaweb.google.co.in/
“Original Light – 1” corresponds to the lighting available for the shot “With Aperture priority – 1” – Shot at 8 PM
“Original Light – 2” corresponds to the lighting available for the shot “Shutter priority – In Camera processed – 2” – Shot at 11 PM
If shot in aperture priority, shutter will be open till the camera feels the light is sufficient.
In shutter priority, photographer has the luxury to set the amount of time shutter should be open.
I have tested for 30 sec mounting on tripod, triggered the shutter using timer/remote.
One can use BULB mode depending on the requirement.
Settings could be base ISO (ISO 50, 100, 200 etc), Exposure as preferred, Color or B/W on taste, Long exposure noise reduction ON (depending on the DSLR).