First of all - good thread!
Secondly, found this handy to have a play with Shutter and Aperture (can see how DOF gets affected too):
Basic Exposure - Shutter and Aperture
Thirdly for those with D80's or other Nikons (note might be bit stupid for some):
D80 Quick Tips:
Aperture Priority Mode
Change Shooting Mode
Creative Time Exposures
Manage Image size
Shutter Priority Mode
The Right Metering Method
White Balance