excellent advice there!
I would like to point out that home depot has an outdoor surge strip with
GFI (GFI is via removeable pigtail) surge strip that can be had for around 30 bucks. Having a surge strip that allows you to cover outlets that are not in use goes a long way in keeping water away from the juice as well.
For those like myself who are into serious
DIY and some nifty power panel customizations there are gel filled wire nuts that can be had for not much more than the regular wirenuts and a vast array of sealed junction boxes. Also good to point out is when installing outlets in workshop / commercial environments the ground prong is usually on the top (which many would think is upside down). This provides a safety in the event a conductive item (such as a screwdriver) is dropped and makes it between the rubber of the plug and the outlet thus hitting the prongs. The dropped item will fall to either side thus making contact with one side of the circuit and ground rather than both sides of the circuit.
Another interesting thing I've noticed is
GFI's can be picky when non grounded items are plugged in that pull high current (some powerheads, heaters, etc). It's usually best to have multiple
GFI circuits or a non
GFI circuit for these two prong items so that you don't lose power to everything in the event of an
GFI "Pop"