can't see it doing any harm, if anything it would have a positive result, but if you feel your computer is getting moisture in it then i would suggest relocation asap!!
I can't see it providing any benefit. Provided it was just sitting in the case, it wouldn't cause any harm either (i.e. assuming it can't get stuck in a fan, etc...)
no they are awsome. when it gets humid here in california, i put them under my hdd's because i have bad airflow there, so i would guess thats where the moisture would hang out.
I don't believe it would be of any benefit at all. Too much air circulating. Those are meant to be placed in closed containers to get rid of moisture in only the air that's in the closed box, etc. Your use is not for its intended purpose. It would have to remove moisture in the whole room/house/office to be effective, but if it makes you feel better, go ahead. It won't hurt anything.
Bronson7