User registration control

Hi!

Do you know if there is any way to control who can register (became a subscriber)? I want my post to be visible only for registered people and I have managed to achieve that pretty easily but I’d like to have a control over the registration process. It would be nice to know the IP address and the email address of a person who wants to register and then be able to accept or reject the registration. I know there is a plug-in called Register Plus but it doesn’t work with the latest WordPress (2.7.1).