Recently I started using WIndowed mode to be able to alt-tab and chat/browse, especially when I needed to check UESP etc. But with Windows 7 (not sure about others) it has a big ugly title bar at the top and doesn't fit perfectly on the screen even if you try to position it.

Well here's a simple solution that also works for other games too:

1. Download http://www.autohotkey.com/download/ - very light weight app, get the _L version
2. Run it and create the sample file, automatically opens for editing
3. Replace the contents with the following:

;-CaptionLWIN & LButton::WinSet, Style, -0xC00000, Areturn;;+CaptionLWIN & RButton::WinSet, Style, +0xC00000, Areturn;

4. Now run AutoHotkey.ahk in your Documents
5. Alternatively create a .ahk file with the following code and run it.

Now you can use Left Windows Key + Left Click and Left Windows Key + Right Click to add or remove title to create the fake fullscreen effect.