I am starting to use Anderson Powerpoles for my electrical connections:
They are pretty cool and come in 15, 30, 45, and 75 amp versions.
they can be locked together (side by side) and have a pretty strong grip.
This little device:
allows you to lock sets together for high vibration environments.
PowerPoles can also be configured in a spiffy chassis mount:
and they make a mating plug for the chassis mount if you want to go that route:
These have become the standard electrical connector used for emergency communications equipment, and you may recognise the larger 350 amp powerpoles:
used often in industrial applications.
-Mike
PS. I should also mention that West Mountain Radio makes a pretty neat line of power distribution products featuring powerpoles - with individually fused circuits. I wish they were a little more space saving though. Here is a pic of their largest one, but they make several smaller ones: