One site that I’ve found to be very useful is bugmenot.com. This site helps you get around the free registration that is required on so many sites. There a good number of reasons why you’d want to do this. Registration is a pain, and takes time. Registration unfailingly requires you to provide them with your email address, which they may sell to other companies, increasing the amount of spam messages you receive. Sometimes they even require your postal address so they can send you junk via snail-mail.
Here’s how it works. Someone registers for the website, creating a throwaway account. They then submit that login to BugMeNot.com. When you want to visit the site, you put the URL for the site into BugMeNot, and it gives you the login and password. No Spam, and no hassle.