diff -Naur xfwm4-4.4.2-orig/defaults/defaults xfwm4-4.4.2/defaults/defaults
--- xfwm4-4.4.2-orig/defaults/defaults	2007-11-17 20:32:16.000000000 +0100
+++ xfwm4-4.4.2/defaults/defaults	2008-05-04 18:23:22.000000000 +0200
@@ -17,6 +17,7 @@
 frame_opacity=100
 full_width_title=true
 inactive_opacity=100
+invert_scroll_workspaces=false
 keytheme=Default
 maximized_offset=0
 move_opacity=100
diff -Naur xfwm4-4.4.2-orig/mcs-plugin/wmtweaks_plugin.c xfwm4-4.4.2/mcs-plugin/wmtweaks_plugin.c
--- xfwm4-4.4.2-orig/mcs-plugin/wmtweaks_plugin.c	2007-11-17 20:32:17.000000000 +0100
+++ xfwm4-4.4.2/mcs-plugin/wmtweaks_plugin.c	2008-05-05 00:13:05.000000000 +0200
@@ -66,6 +66,7 @@
 static gboolean raise_with_any_button = FALSE;
 static gboolean restore_on_move = TRUE;
 static gboolean scroll_workspaces = TRUE;
+static gboolean invert_scroll_workspaces = FALSE;
 static gboolean snap_resist = FALSE;
 static gboolean toggle_workspaces = FALSE;
 static gboolean unredirect_overlays = FALSE;
@@ -317,6 +318,12 @@
 }
 #endif
 
+static void
+cb_scroll_workspaces_changed (GtkWidget * widget, gpointer user_data)
+{
+    gtk_widget_set_sensitive (GTK_WIDGET (user_data), gtk_toggle_button_get_active GTK_TOGGLE_BUTTON (widget));
+}
+
 static void
 cb_dialog_response (GtkWidget * dialog, gint response_id)
 {
@@ -356,6 +362,8 @@
     GtkWidget *range;
     GtkWidget *action_area;
     GtkWidget *button;
+    GtkWidget *check_button_scroll_workspaces;
+    GtkWidget *check_button_invert_scroll_workspaces;
     guint nth = 0;
 
     static const gchar *const modifier_list[] = { 
@@ -491,12 +499,21 @@
     gtk_container_add (GTK_CONTAINER (notebook), vbox);
     gtk_widget_show (vbox);
 
-    check_button =
+    check_button_scroll_workspaces =
         create_gboolean_button (mcs_plugin,
         _("Switch workspaces using the mouse wheel over the desktop"), "Xfwm/ScrollWorkspaces",
         &scroll_workspaces);
-    gtk_box_pack_start (GTK_BOX (vbox), check_button, FALSE, TRUE, 0);
-    gtk_widget_show (check_button);
+    gtk_box_pack_start (GTK_BOX (vbox), check_button_scroll_workspaces, FALSE, TRUE, 0);
+    gtk_widget_show (check_button_scroll_workspaces);
+
+    check_button_invert_scroll_workspaces =
+        create_gboolean_button (mcs_plugin,
+        _("Invert mouse wheel workspace switching direction"), "Xfwm/InvertScrollWorkspaces",
+        &invert_scroll_workspaces);
+    gtk_box_pack_start (GTK_BOX (vbox), check_button_invert_scroll_workspaces, FALSE, TRUE, 0);
+    gtk_widget_show (check_button_invert_scroll_workspaces);
+    gtk_widget_set_sensitive (check_button_invert_scroll_workspaces, gtk_toggle_button_get_active GTK_TOGGLE_BUTTON (check_button_scroll_workspaces));
+    g_signal_connect (G_OBJECT (check_button_scroll_workspaces), "toggled", G_CALLBACK (cb_scroll_workspaces_changed), check_button_invert_scroll_workspaces);
 
     check_button =
         create_gboolean_button (mcs_plugin,
@@ -751,6 +768,7 @@
     init_gboolean_setting (mcs_plugin, "Xfwm/RestoreOnMove", &restore_on_move);
     init_gboolean_setting (mcs_plugin, "Xfwm/SnapResist", &snap_resist);
     init_gboolean_setting (mcs_plugin, "Xfwm/ScrollWorkspaces", &scroll_workspaces);
+    init_gboolean_setting (mcs_plugin, "Xfwm/InvertScrollWorkspaces", &invert_scroll_workspaces);
     init_gboolean_setting (mcs_plugin, "Xfwm/ToggleWorkspaces", &toggle_workspaces);
     init_gboolean_setting (mcs_plugin, "Xfwm/UnredirectOverlays", &unredirect_overlays);
     init_gboolean_setting (mcs_plugin, "Xfwm/UseCompositing", &use_compositing);
diff -Naur xfwm4-4.4.2-orig/src/events.c xfwm4-4.4.2/src/events.c
--- xfwm4-4.4.2-orig/src/events.c	2007-11-17 20:32:13.000000000 +0100
+++ xfwm4-4.4.2/src/events.c	2008-05-04 20:14:44.000000000 +0200
@@ -860,11 +860,11 @@
 
     if (ev->button == Button4)
     {
-        workspaceSwitch (screen_info, screen_info->current_ws - 1, NULL, TRUE, ev->time);
+        workspaceSwitch (screen_info, screen_info->current_ws - (screen_info->params->invert_scroll_workspaces ? -1 : 1), NULL, TRUE, ev->time);
     }
     else if (ev->button == Button5)
     {
-        workspaceSwitch (screen_info, screen_info->current_ws + 1, NULL, TRUE, ev->time);
+        workspaceSwitch (screen_info, screen_info->current_ws + (screen_info->params->invert_scroll_workspaces ? -1 : 1), NULL, TRUE, ev->time);
     }
 }
 
diff -Naur xfwm4-4.4.2-orig/src/settings.c xfwm4-4.4.2/src/settings.c
--- xfwm4-4.4.2-orig/src/settings.c	2007-11-17 20:32:13.000000000 +0100
+++ xfwm4-4.4.2/src/settings.c	2008-05-04 18:29:52.000000000 +0200
@@ -456,6 +456,10 @@
                     {
                         screen_info->params->scroll_workspaces = setting->data.v_int;
                     }
+                    else if (!strcmp (name, "Xfwm/InvertScrollWorkspaces"))
+                    {
+                        screen_info->params->invert_scroll_workspaces = setting->data.v_int;
+                    }
                     else if (!strcmp (name, "Xfwm/ToggleWorkspaces"))
                     {
                         screen_info->params->toggle_workspaces = setting->data.v_int;
@@ -858,6 +862,12 @@
             setBooleanValueFromInt ("scroll_workspaces", setting->data.v_int, rc);
             mcs_setting_free (setting);
         }
+        if (mcs_client_get_setting (screen_info->mcs_client, "Xfwm/InvertScrollWorkspaces", CHANNEL5,
+                &setting) == MCS_SUCCESS)
+        {
+            setBooleanValueFromInt ("invert_scroll_workspaces", setting->data.v_int, rc);
+            mcs_setting_free (setting);
+        }
         if (mcs_client_get_setting (screen_info->mcs_client, "Xfwm/ToggleWorkspaces", CHANNEL5,
                 &setting) == MCS_SUCCESS)
         {
@@ -1329,6 +1339,7 @@
         {"frame_opacity", NULL, TRUE},
         {"full_width_title", NULL, TRUE},
         {"inactive_opacity", NULL, TRUE},
+        {"invert_scroll_workspaces", NULL, FALSE},
         {"keytheme", NULL, TRUE},
         {"margin_bottom", NULL, FALSE},
         {"margin_left", NULL, FALSE},
@@ -1563,6 +1574,8 @@
         !g_ascii_strcasecmp ("true", getValue ("wrap_cycle", rc));
     screen_info->params->scroll_workspaces =
         !g_ascii_strcasecmp ("true", getValue ("scroll_workspaces", rc));
+    screen_info->params->invert_scroll_workspaces =
+        !g_ascii_strcasecmp ("true", getValue ("invert_scroll_workspaces", rc));
     screen_info->params->wrap_resistance =
         abs (TOINT (getValue ("wrap_resistance", rc)));
 
diff -Naur xfwm4-4.4.2-orig/src/settings.h xfwm4-4.4.2/src/settings.h
--- xfwm4-4.4.2-orig/src/settings.h	2007-11-17 20:32:13.000000000 +0100
+++ xfwm4-4.4.2/src/settings.h	2008-05-04 18:28:09.000000000 +0200
@@ -211,6 +211,7 @@
     gboolean focus_hint;
     gboolean focus_new;
     gboolean full_width_title;
+    gboolean invert_scroll_workspaces;
     gboolean prevent_focus_stealing;
     gboolean raise_on_click;
     gboolean raise_on_focus;