diff -r 44d65d9bfda4 -r aa4ea3cade3c QTfrontend/gameuiconfig.cpp
--- a/QTfrontend/gameuiconfig.cpp	Fri Dec 28 11:00:12 2012 +0100
+++ b/QTfrontend/gameuiconfig.cpp	Sat Dec 29 14:40:20 2012 +0200
@@ -34,6 +34,7 @@
 #include "fpsedit.h"
 #include "HWApplication.h"
 #include "DataManager.h"
+#include "SDL.h"
 
 
 const QNetworkProxy::ProxyType proxyTypesMap[] = {
@@ -74,6 +75,20 @@
             Form->ui.pageOptions->CBResolution->setCurrentIndex(0);
     }
     else Form->ui.pageOptions->CBResolution->setCurrentIndex(t);
+    
+    // Default the windowed resolution to 2/3 of the screen size
+    int screenWidth = SDL_GetVideoInfo()->current_w * 2 / 3; 
+    int screenHeight = SDL_GetVideoInfo()->current_h * 2 / 3; 
+    QString widthStr; widthStr.setNum(screenWidth);
+    QString heightStr; heightStr.setNum(screenHeight);
+    QString wWidth = value("video/windowedWidth", widthStr).toString();
+    QString wHeight = value("video/windowedHeight", heightStr).toString();
+    // If left blank reset the resolution to the default
+    wWidth = (wWidth == "" ? widthStr : wWidth);
+    wHeight = (wHeight == "" ? heightStr : wHeight);
+    Form->ui.pageOptions->windowWidthEdit->setText(wWidth);
+    Form->ui.pageOptions->windowHeightEdit->setText(wHeight);
+    
     Form->ui.pageOptions->CBResolution->setCurrentIndex((t < 0) ? 1 : t);
     Form->ui.pageOptions->CBFullscreen->setChecked(value("video/fullscreen", false).toBool());
     bool ffscr=value("frontend/fullscreen", false).toBool();
@@ -200,6 +215,8 @@
 void GameUIConfig::SaveOptions()
 {
     setValue("video/resolution", Form->ui.pageOptions->CBResolution->currentText());
+    setValue("video/windowedWidth", Form->ui.pageOptions->windowWidthEdit->text());
+    setValue("video/windowedHeight", Form->ui.pageOptions->windowHeightEdit->text());
     setValue("video/fullscreen", vid_Fullscreen());
 
     setValue("video/quality", Form->ui.pageOptions->SLQuality->value());
@@ -322,11 +339,17 @@
 QRect GameUIConfig::vid_Resolution()
 {
     QRect result(0, 0, 640, 480);
-    QStringList wh = Form->ui.pageOptions->CBResolution->currentText().split('x');
-    if (wh.size() == 2)
-    {
-        result.setWidth(wh[0].toInt());
-        result.setHeight(wh[1].toInt());
+    if(Form->ui.pageOptions->CBFullscreen->isChecked()) {
+        QStringList wh = Form->ui.pageOptions->CBResolution->currentText().split('x');
+        if (wh.size() == 2)
+        {
+            result.setWidth(wh[0].toInt());
+            result.setHeight(wh[1].toInt());
+        }
+    }
+    else {
+        result.setWidth(Form->ui.pageOptions->windowWidthEdit->text().toInt());
+        result.setHeight(Form->ui.pageOptions->windowHeightEdit->text().toInt());
     }
     return result;
 }