Adding more information onto the $user object in drupal?

Question

How would I go about loading my own data onto the $user object upon login of a user?

Answer 1

hook_user() probably has the functionality you need

custommodule_user($op, &$edit, &$account, $category = NULL){
    global $user;
    if($op=='login'){
        $user->custommodule['data']='some stuff';
    }
}