I wrote a post at OtherInbox about how using disposable email addresses can help you to protect yourself from spam. It's a great concept, because you actually have the power to finally stop spam, for the first time ever. It works like this:
When I sign up for an email address at amazon, I use firstname.lastname@example.org. If amazon ever starts to send me spam, I know exactly where it came from. This obviously becomes really useful if you sign up for a free ipod offer. You may receive email about a 1,000 other offers unrelated to the free ipod; now you'll know which companies you shared your email addresses with are sharing your email address.
Novel idea, huh? Well, this is definitely a great approach to stopping spam.