COMPRESSED AIR HAS FREON IN IT
Best Buy stores recommend you hold the can upright. They told me the reason is that there is freon in with the aerisol and that when you hold the can upside down, only the freon comes out. They also said in the upside down position, the freon can cause serious damage to skin, eyes, etc. and to never joke around with anyone by spraying them with the can upside down... the sales person then showed me a permanent burn mark on his arm where a friend had sprayed him.
I know of someone who works with jewelry and when she can't get a section pryed apart with traditional tools, she will use a can of this and hold the can upside down, spray the connection she needs to break, then hit it and it breaks apart. What she is doing is basically freezing the connection to a sub zero temp by holding the can upside down.
Personally, I stay away from the stuff. I make sure my pc is turned off and then I use the vacuum cleaner on it. I've done this for eight years and had no problems.
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