Just stumbled with my fat fingers and found that the Windows Key + a number key (1,2,3 etc.) will switch you to the corresponding window in the taskbar. So if the first window shown in your taskbar is Datacad (yea Datacad!) then you can hit Win+1 to switch to that window. If that window is already your active window, then it will minimize that window. This works in Windows 7 – Win XP or 8, who knows? The Shadow Knows!

taskbar