Peter introduced me to this cool site. BugMeNot allows you to find (and share) access information for numerous sites that require registration. By using BugMeNot, you can bypass compulsory registration and thus not have to release your personal details.
To boot, you can also create a disposable e-mail address on this site. This will allow you to register with a valid e-mail address without giving your real one. Nifty!