Minimize (almost) any window to the systray
RBTray is a small Windows program that runs in the background and allows almost any window to be minimized to the system tray by right clicking its minimize button.
This is a nice tool that runs perfectly well on Windows 8 with minimal resource usage. It works with any window I tried yet, doesn’t require administrative rights as far as I know, has no cumbersome installation/setup process, and the code is open source (C++).
Give it a try if you use Windows :)