Default Audio Changer is a program that can change the default audio device on a Vista & Windows 7 OS-es. It is especially useful if you're like me and have a sound card with speakers attached and a USB headset/headphones.
It is made for lazy people, so if you're not lazy, you can continue to use the control panel application (mmsys.cpl).
Windows 10 and still working like a charm.
Easy to configure, minimalistic design, fits well in the tray, works flawlessly. All the competing utilities can go and... I don't know, do something else.