Post-Registration, post-meta hook?

You can use user_register

add_action('user_register', 'wpse42506_user_register', 10, 3);
function wpse42506_user_register( $user_ID ) {
    // do stuff here
}

If you want to just use the user information, you can use get_userdata
http://codex.wordpress.org/Function_Reference/get_userdata

If you need more control, you can initiate a new WP_User
http://codex.wordpress.org/Class_Reference/WP_User

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