Devices can generate smells

I was going through Slashdot and I found that devices can be used to generate smells. I got interested and went to the following link. It explained me more. Some time back, My friend has asked me for some object. I just jokingly told him that I'll send him thru attachment of an e-mail. He said that, there are things which are tangible and untangible. But after seeing this, I feel that that the day by which we can send objects through emails is not tooooooooooooo far... :) :)