This is excellent! A site that provides generic logins to sites where you may not want to register and provide personal information: BugMeNot.com. You enter in the URL of the site that you want to access, and it gives you a log-in to use. I always give fake information anyway, but this is slicker -- prevents you having to register at all, fake information or not.

Found in a CNN article about newspapers requiring you to register in order to read their stories online: Complaints over online newspaper registration.