@wilddog
Thanks for the reply
. I'm not 100% sure about recommending Windows 8, but Windows 7 is one of the best OS's in history. I would 100% recommend an upgrade to it at minimum. Windows 8, if you ignore the Start Screen (I see it for about 10-20 seconds throughout a 12 hour session) and treat it like a Start Menu, is even faster, with a great Desktop UI and many improvements for ease of use. It runs better then Windows 7 on older machines as well. Overall the newest OS is fast, modern and far more secure, and is really good for multitasking. And if you for some reason 100% hate the new Start Screen, just download Classic Shell to restore the Start Menu.
Onto the interface itself, the docking (dragging out for example 2D View Window works, then putting it back) works fine. Something related to it, as far as I know Vista, Windows 7 and 8 all have Aero Snap, which is pinning 2 applications side by side by throwing them to the left and right of the screen. IWTE isn't working 100% with it. It doesn't confine to 50% of the screen space, it wants 60% which hurts multitasking.
Example below:
One other app you might want to take inspiration from for use of minimal colour but great UI is Notepad++. Tons of content and features, yet looks clean and is lively enough with subtle yet really nice color.
Example below (with Aero Snap)