The website would be called aerogram and would have to take up the whole screen like a screen saver.
The idea is based on the idea of planes dragging messages around the sky.
It applies that idea to email / hotmail messages.
The user would type their message in a text box and then they send the email as usual. When the receipient opens the message they would get an animated plane dragging the senders message.
It'd need to be setup something like one of those e-cards websites, where the person goes to the website and enters the message and the destination email address, and the site sends it on their behalf.
I think it would make a good Facebook App - but I do not know how I could be paid for it.