Many people probably won't be interested in this .. but someone may find it interesting...
This person has kept every piece of spam he recieved since mid 1997 and then created statistics using the data ..
anyway have a look it shows some interesting factsI have kept every single piece of spam and virus email since mid-1997. Occasionally, it comes in handy, for example, to add na´ve Bayesian spam filter to my custom-written email filter. And occasionally I use it to build a chart of spam and virus email.