The accumulators that AIM sells are just two 1/2 gallon tanks welded together with separate chambers. 1/2 gallons is way too much air. I tried it that way and I could push my car to the ground by the back bumper.
I used these tanks
http://www.truckspring.com/airsprings/firestone/product/air_tank_1_4.asp
You could run air tools off of the compressor but not for very long. You will run out of air too quick. I have an attachment to blow up air mattresses at shows and innertubes when I float down the river.
I am using AIM 4inch in front and SMC 3.5s in the back