Sign up to lots of forums / online forms ?
Fed up of receiving spam? Help bust spam by creating a temporary email account that forwards all mail onto your primary account! TrashMail.net allows you to create a temporary email forwarding address: It allows you to set the length of time the account should be activated for, set the number of forwards it should make to your email account, and here is the best bit when it exceeds the limit of forwarding or reaches the expiry date / the email forwarding account will automatically be deleted, meaning no more spam! With this utility you will never have to give out your primary email account to websites etc!
I have given this ago and it works a treat, there is also a firefox plugin avaliable
Give it ago and help crack down on Spam 
Check out these figures on rejected emails from the site (which is always updating) 55 750 661 totally rejected since july 2007
