Here is an interesting service to help you keep spam to a minimum, it is called Mailinator, below is their own description of the service.
Have you ever gone to a website that asks for your email address? (haven't we all). You know that the moment you type it in, it is streaming across the net on its way to every spam database in the world. You simply can't be that careless with your personal email address.
What if there was a website that any and every email address you can think of already exists. And you use any one you like, anytime you like - just by thinking one up.
Welcome to Mailinator™. It's like super-instant, always-ready, any-email-you-want email. Right now. It's your personal disposable email account. Here is how it works: You are on the web, at a party, or talking to your favorite insurance salesman. Wherever you are, someone (or some webpage) asks for your email. You know if you give it, you're gambling with your privacy. On the other hand, you do want at least one message from that person. The answer is to give them a mailinator address. You don't need to sign-up. You just make it up on the spot. Pick firstname.lastname@example.org or email@example.com — pick anything you want.
Later, come to this site and check that account. Its that easy. Mailinator accounts are created when mail arrives for them. No signup, no personal information, and when you're done — you can walk away — an instant solution to one way spammers get your address. It's an anti-spam solution for everyone. Your temporary email account will be automatically deleted for you after a few hours.
I tried it out a few times now and it works pretty well - very cool.