Disposable email addresses: jetable.org (all-purpose), spam.la (throwaway site registrations), SpamGourmet (all-purpose). I'll have to remember those sites next time I need to specify an email address for a website membership I know I won't need to recover...

another.com allows you to turn email addresses on and off. Useful if an addy you still want to use becomes a spam trap. Turn it off for a week and watch the spammers get to ****