I have an edited plugin laying arround to find the guid of a user I'll package it up and post it here, it's just an edited version of user_contact_list.

Here's the zipped up edited plugin:

www.robertscmc.com/mf_user_contact_list.zip

Just remove line 18 and 27 in the start.php file because those lines limit plugin access to guid 2 who is an admin so just remove those lines and  all admins can now see the plugin in the admin menu... hope this helps :)

$username = "admin";
echo "\n*** fetch user=($username)";
echo "\n*** get_user_by_username";
$user = get_user_by_username($username);
if ($user) {
        echo "\n*** user($username) FND OK";
        $userGuid = $user->getGUID();

this will give you guid for a given username

Also Table: elgg_users_entity display in phpmyadmin -->
you can also browse to your hearts content ; -)

how about using this plugin?

http://community.elgg.org/pg/plugins/uddhavadasa/read/181100/guid-tool

so many ways to skin the cat... ;-)

Thanks for the info.  I was able to find the GUID but the "be tom" plugin failed to work.  Below is the code I had to modify.  My GUID is "129".  Did I fill in the info correctly?

<?php

/* Be Tom - Elgg plugin to automatically add the user you specify as friends with every new user that registers on your site.
 *
 * Instructions:
 * *************
 * 1) Find the GUID for the user you want to be Tom.
 *     If you don't know how a simple way is to look at any of
 *     the action links on their profile and in the link there will
 *     be a part where it says guid=123. 123 is what you want.
 * 2) Put that GUID below in the $friend_guid = 2; line
 * 3) Decide if you want to get emails when people join and become your friend automatically.
 *     By default this is set to not allow the emails to get sent out.
 *     To change it look below for $i_want_emails = false; and make it $i_want_emails = true;
 *
 * And of course check out my Elgg blog for updates, mods, and articles about setting my own Elgg based site up.
 * Blog: http://www.addicted2kicks.com/devblog/
 * Elgg Site: http://www.addicted2kicks.com/
 *
 * Version 1.0 - Zac
 * It's a low priority, but a future todo item will be a page in the admin interface to allow you to
 * configure this plugin easily w/o messing with code. It's a very low priority, but if there is a lot
 * of interest I will start on it.
 */
 
function betom_init(){
 global $CONFIG;
 register_elgg_event_handler('create', 'user', 'AutoAddFriend',501);
}

function AutoAddFriend($event, $object_type, $object){
 global $CONFIG;
 
 $friend_guid = 129; //REPLACE THE GUID # HERE WITH THE ONE YOU WANT!
 
 if($friend = get_entity($friend_guid)) {
  //READ ME: If you want your 'Tom' to receive emails every time someone registers (it'll be the friend added email) then you
  //need to set the below variable to false instead of true.
  $i_want_emails = true;
  
  if(!$i_want_emails) {
   //The engine/lib/relationships.php file would usually catch the friend created event and send an email to our Tom.
   //This will prevent that by removing any hooks that would handle the friend created event.
   //This will also stop any other plugins from interfering with our friend add process (say a friend request plugin)
   if(isset($CONFIG->events['create']['friend'])) {
    $oldEventHander = $CONFIG->events['create']['friend'];
    $CONFIG->events['create']['friend'] = array();   //Removes any event handlers
   }
  }
  
  try {
   $_SESSION['user']->addFriend($friend_guid);
  } catch (Exception $e) {
  }
  
  //If we disabled any events below then reenable them:
  if(!$i_want_emails) {
   if(isset($CONFIG->events['create']['friend'])) {
    $CONFIG->events['create']['friend'] = $oldEventHander;
   }
  }
 }
}

register_elgg_event_handler('init', 'system', 'betom_init');

?>