Meet Olly, a "web connected smell robot" that converts tweets, Facebook notifications, RSS feeds - whatever you want - into smells:
Olly has a removable section in the back which you can fill with any smell you like. It could be essential oils, a slice of fruit, your partner's perfume or even a drop of gin. [...] Olly is stackable, so if you have more than one, you can assign each one to a different service with a different smell. Connect one to Twitter and another to your calendar. Before you know it, you'll have a networked internet smell centre.