Widget to display Users in a list

This does more than you ask for but edit as needed.

<?php
//displays all users with their avatar and their posts (titles)
$blogusers = get_users_of_blog();
if ($blogusers) {
  foreach ($blogusers as $bloguser) {
    $user = get_userdata($bloguser->user_id);
    echo '<p>User ID ' . $user->ID . ' ' . $user->user_firstname . ' ' . $user->user_lastname . '</p>';
    echo get_avatar( $user->ID, 46 );
    $args=array(
      'author' => $user->ID,
      'post_type' => 'post',
      'post_status' => 'publish',
      'posts_per_page' => -1,
      'caller_get_posts'=> 1
    );
    $my_query = null;
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {
      //echo 'List of Posts for ' . user->user_firstname . ' ' . $user->user_lastname;
      while ($my_query->have_posts()) : $my_query->the_post(); ?>
        <p><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></p>
        <?php
      endwhile;
    }
  wp_reset_query();  // Restore global post data stomped by the_post().
  }
}
?>

Download and install Otto’s PHP Code Widget, put that code in one of those widgets.

Thank you Michael! That looks pretty much like what I was looking for.

However I’d like to have their avatars displayed and next to it their names. This one does not display their usernames, but their ID’s and posts, which is irelevant for me.

Also this code simply lists every member whereas I’d like to be able to chose specific members (I only want to display certain members).

I try to do this on my own and work at the code, but I’m a novice at PHP. If it’s very easy to do that for someone who knows his/her way around, I’d really appreciate any help on this.

Might try this then:
https://www.ads-software.com/extend/plugins/author-avatars/

Thanks! The combination of Otto’s PHP Widget and the Author-Avatars Widget worked for me.

The Author-Avatars Widget creates the PHP I needed and the PHP Widget displays it in the Sidebar!