I was intrigued by the excess skin issue as well. And I heard some compelling advice which I shall relay now, though one must not confuse the following for any kind of medical advice (for that one should try to find a health or fitness professional with experience working with large changes in weight, and NOT also selling plastic surgery )

I'll build an analogy from the explanation I recieved, I'm in computers and teaching, analogies are what I do

Imagine one blows up a balloon, then fills it with a sticky gluggy substance, kinda like honey, or some weird gluggy waxxy substance (yeah I'm alluding to fat) (I also appreciate that filling the balloon while blown up is physically impossible, just bear with me). Make sure the thick layer of glugginess coats the entire balloon. When you let the air out, the balloon, which normally would have contracted back to normal size, stays saggy and large, because there's a sub-cutaneous framework holding it out there. The problem is not so much that there is extra skin, at your (and it looks like my) age the skin elasticity is still pretty good. It's the remaining fat adhering to the skin. Apparently the subcutaneous layer is some of the toughest to shake. The gentleman from whom I gained this advice is said to have seen it repeatadly, there's even some fancy name for it. He said once the hard yards had been done, you've just keep cutting untill you get to a low skin fold. The first part is shrinking the waist line, all work from now on will shrink the skin back into place.

I offer two pieces of evidence for your consideration.

a) if your skin hadn't already contracted alot you'd be able to pitch a tent with whats left (man you lost a boatload of weight, freakin' good on ya'), but you've really got relatively little skin left, (look at those piccies and try to imagine if your skin hadn't shrunk any at all)

b) Pregnant ladies, and I'm talking triplets and stuff here get huuuuuuge bellies, but those who maintain a relatively low body fat percentage recover perfectly (after a bit of toning) after their birth, well the birth of their... you know what I mean).

finally, the other issue that should be raised is stretch marks. these are more like scars in their creation, and may never fade completely, but I'm assured if you find a good moisturiser for the final cutting stages, and apply relatively frequently, they will at worst fade alot, and at best virtually dissapear.

check out some of the transformations from
http://www.bodybuilding.com/fun/trans.htm

specifically
http://www.bodybuilding.com/fun/trans7.htm (edit) on second looks he has a scar, he may have had plastic surgery. There's another even better example on there somewhere
http://www.bodybuilding.com/fun/trans11.htm

(edit, this is the one I was looking for)
http://www.bodybuilding.com/fun/louis.htm
he has a q and a page where he specifically, but briefly covers excess skin, he basically said that it all tightened up as he kept losing weight.

Thats all
goodnight