BugMeNot.com Compliment - Free Website Log-ins
I just mentioned this on a review and figured many don't know of this place. If you come across a website that requires registration to view pages, you can go to www.bugmenot.com and enter the site that wants you to register. Many times, you can find working pre-existing email,user and password combinations that users have submitted. It's a nice option since any email account used in these cases are generally spammed and sold 40 times over.
This way it protects your active accounts and you won't have to create a throwaway just to see a webpage.