##JavaSript / Soapi.JS

using Soapi.JS

Soapi.RouteFactory("api.stackapps.com", apiKey) // get all users
.Questions({ pagesize: 100 }).getPagedResponse(function(data) {

    var values = {}, keys = [];
    // add up the favorite for each user
    for (var i = 0; i < data.items.length; i++) {
        var q = data.items[i];
        var u = q.owner;
        if (u) {
            if (!values[u.user_id]) {
                keys.push(u.user_id);
                values[u.user_id] = {
                    display_name: u.display_name,
                    favorite_count: 0
                };
            }
            values[u.user_id].favorite_count += q.favorite_count;
        }
    }

    // sort and dump
    var output = "";
    for (var i = 0; i < keys.sort(function(a, b) {
        return values[b].favorite_count - values[a].favorite_count;
    }).length; i++) {
        output += values[keys[i]].favorite_count + " " + values[keys[i]].display_name + "\r\n";
    }

    document.getElementById("output").innerHTML = output;

});
   

Output:

100 Kevin Montrose
88 George Edison
81 code poet
28 Soviut
27 lfoust
22 Adam Wright
22 systempuntoout
21 S.Mark
20 Felix
17 Farseeker
16 Dave DeLong
11 Dave Swersky
10 Bill the Lizard
9 Matt S.
9 Franci Penov
8 Jeff Atwood
8 Edan Maor
7 Jedi Master Spooky
7 codeka
7 carson
7 nabeelmukhtar
7 Shay Erlichmen
7 swanson
6 Steffen Opel
6 Lucas Jones
6 Jason
6 Thomas McDonald
6 Kyle Cronin
6 Joel Potter
5 conmulligan
5 Catchwa
5 Jonathan
5 TheHurt
5 Ricky
5 SztupY
5 ColinD
5 Mark Rushakoff
4 Adam
4 jjnguy
4 chenyuejie
4 Koning Baard
3 Yacoby
3 phsr
3 Nick Presta
3 Igor Zevaka
3 johnwards
3 blork
3 Robert Munteanu
3 Riduidel
3 InfinitiesLoop
3 Martin Plante
2 tonklon
2 Ryan Brunner
2 Dennis Williamson
2 Soldier.moth
2 eWolf
2 Josh Kelley
2 radius
2 James A. Rosen
2 Kevin
2 RichH
2 Nippysaurus
2 Peter Mortensen
2 John Bristowe
2 Mark Hurd
2 adrianbanks
1 Alexandre Rafalovitch
1 balpha
1 Matt Culbreth
1 mlaw
1 Nathan Reed
1 Nicolas Raoul
1 tsudot
1 Ngu Soon Hui
1 Nathan Voxland
1 Joe
1 Michael B.
1 Shane
1 Frank Krueger
1 Robert Cartaino
1 Charles Stewart
1 svick
1 jmoy
1 Fernando
1 Peter Mourfield
1 pufferfish
1 Artefacto
1 Robert Love
1 iconiK
1 voyager
1 coobird
1 Lucas McCoy
1 Chacha102
1 Matthew Pelser

Requests generated

#   Result  Protocol    Host    URL Body    Caching Content-Type    Process Comments    Custom  
1   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=1&jsonp=Soapi._internal._callback0  14,525  private     application/json; charset=utf-8 iexplore:5676           
2   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=2&jsonp=Soapi._internal._callback1  14,704  private     application/json; charset=utf-8 iexplore:5676           
3   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=3&jsonp=Soapi._internal._callback2  15,407  private     application/json; charset=utf-8 iexplore:5676           
4   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=4&jsonp=Soapi._internal._callback3  14,012  private     application/json; charset=utf-8 iexplore:5676           
5   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=5&jsonp=Soapi._internal._callback4  14,457  private     application/json; charset=utf-8 iexplore:5676           
6   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=6&jsonp=Soapi._internal._callback5  4,234   private     application/json; charset=utf-8 iexplore:5676           
7   200 HTTP    api.stackapps.com   /1.0/questions?key=foo-bar-fu&pagesize=100&page=7&jsonp=Soapi._internal._callback6  204 private     application/json; charset=utf-8 iexplore:5676