Jc05, I am going to let you in on a little secret, if you promiss to give me half of the profit, LOL.
No, seriously, you have had all kinds of answers on this question so here comes my Jackson's worth. He's the one on a twenty dollar bill isn't he?
I have taken them off several houses.
I have replaced some on several houses.
The last contract I signed to replace a few of them and paint the house cost me dearly. I thought I had enough saved in the barn to do the job but one of the dang helpers had threw bricks and blocks on them and broken almost every one I had saved.
It took me I forget how long, about a month or so to find some and and I had to buy 88 of them @ @19.00 a piece. $1,672.00

I remember the number because I like Dale Jarrett in racing and that's his number.
That was well over half the profit on the job I was doing. It was the only place I could find them and the home owner was on my butt.
There is a lot of contractors still replacing a few here and there when painting houses. That is when they can find them.
You can take them off being very carefull, and I mean carefull, and not break them.
There is no dust to speak of until they break and not much then. The dust comes in when you have to cut them when replaceing.
Just look at each one them as a 20 dollar bill. Start at the top and there is more than likely a cut row at the top and surely will be on the gable ends.
You may even be able to sale the cut ones but they would probably be harder to get rid of. I would get rid of the cuts and broken and only kep the whole one to sell.
If you get a small 6" or 8" flat prybar you can sugar them off if carefull.
Chances are you will break one for one to start with but as you go, the ratio of good ones will increase and every one you save is better than a Jackson. It won't decrease in value as our money is now. It will only gain value.
There is a lot of cities that are "preserveing the history" and they can't take thier siding off and put up vinyl, etc.
The historic section in our city kills me. People buy houses not knowing they are under these rules and the city won't budge.
I don't know where you live, But I would almost come there and take them off for you, just for the shingles themselves.
Now as for the legallity of taking them off.
It is a federal felony to remove asbestos, if you are a contractor, with a maximun of $10,000 fine and one year in prison, if you do not have a licence to do so.
I am not sure as to what the regs are for a homeowner, but even disposeing of them incorrectly could be a head ache you don't want.
I don't know how everyone else is, but with all the gadgets they have today, if I am going to call the building inspector to find out the rules and regs for someting like this, and was thinking about ignoreing them if they didn't suit me, I would call from a public phone somewhere.

Hey, they can trace any number thay care to. I wouldn't want to be the one to get caught because I called and ask and paid no attention to what they said.
At least if you get caught you can play dumb.
But as far as just removeing them, I would as I have did, stay out of the side the wind is blowing too and try my best to save them.
If you conceder a stack a foot tall may be worth $500 to $1,000,

, I think I would hit e-bay before taking them off.
Go to historical sites or whatever and find people that need them and
" I think you can probably pay for the top of the line siding of your choise by selling them to who truely needs them."
I know they are like Gold around here when you can find them.
I may buy some of from you myself, after I call a few people to see if they ever had there jobs done... I can't find them up here. Danville Lumber company had a small supply for a long time but it's been depleted for several years now, and I had several jobs I could have done if I could have found some more. I would call and find out what the regs are for a homeowner doing it himself in your area, what the disposal cost will be and go from there. But don't throw those twenty dollar bills away, lol.
It is still legal to replace broken ones. I know that and it doesn't take the high dollar construction company to do so.
God Bless
Dennis