Not sure how many people are familar with this, so i guess i would just re-iterate.
Hate spam? Don’t want to use your personal email address for signups? How about using disposable/temporary email address?
Check out the following provider

http://www.guerrillamail.com/
http://mytrashmail.com/
http://www.mailinator.com/
http://www.mailexpire.com/
http://www.temporaryinbox.com/
http://www.maileater.com/
http://www.jetable.org/en/index
http://10minutemail.com/10MinuteMail/index.html

But one of my favourite site before registering any other site
www.bugmenot.com/
Provides and share pre-registered accounts.