ex voto if everything else is in good repair your pressure cycling switch may have gone bad, both of mine have. This switch is located on top of the accumulator normally sticking out of the side of the low pressure valve T. As long as your AC system is over 25 psi (I think) on the low side this switch should be closed, you can check the continuity with a multimeter but I have found a couple that check out fine with a meter but wont pass enough current to cycle the compressor clutch. I would recommend replacing it, at about $10 it's good insurance against another outage even it doesnt fix this problem. Other than that if you arent getting voltage to the clutch it could be the WOT cut out relay that cuts out the AC compressor clutch when you floor it, or the fuse, or a bad gound to the clutch coil. Good luck.
jemail, I would recommend replacing the seals on the springlock fittings and installing a new oriffice tube as well, both of mine were full of crap. Have some AC oil on hand to, most auto parts stores will have it in the AC section. I'm talking real oil here not the stuff in a pressurized can, the only brand I have seen so far is castrol. The ford manual (if you dont have one, get one before starting this) will give you a guide line as to how much oil to add to which part. Other than that it is pretty straight forward.
