] The following chart plots every single piece of spam and
] virus email that arrived at my work email address since
] April 1997. Blue dots are spam and red dots are email
] viruses. The horizontal axis is time, and the vertical
] axis is size of mail (on a logarithmic scale). Darker
] dots represent more messages. (Messages larger than 1MB
] have been treated as if they were 1MB.)

A visual history of spam (and virus) email