BuddyPress.org

To show xprofile fields, you could do this:

// add the custom column header
function philopress_modify_user_columns($column_headers) {

        $column_headers['extended'] = 'Meta Fields';
  
        return $column_headers;
}
add_action('manage_users_page_bp-signups_columns','philopress_modify_user_columns');

// dump all the pending user's meta data in the custom column
function philopress_signup_custom_column( $str, $column_name, $signup_object ) {

	if ( $column_name == 'extended' ) 
             return print_r( $signup_object->meta, true );

        return $str;
}
add_filter( 'bp_members_signup_custom_column', 'philopress_signup_custom_column', 1, 3 );

If you only want to show specific meta fields, you need to know the field id(s).
Then you could do this:
return $signup_object->meta['field_4472'];

GIST