I think the IC2 guys are recoding the Personal Safe so that it can be piped into, not out. We'll have to wait and see if they add the redstone output, though.
Example: I want a static suply on pickaxes, but chest are limeted, so i have a chest full of cobblestone and one full with sticks... if the chest with pickaxes is not full some of the sticks and somme cobble is sucked into a automated workbench and one pickaxe is pumped into the safe...