Tummy PowerMenu
http://www.veridicus.com/tummy/programming/powermenu/

this is a cool little one. it rolls together three functions usually found in different programs.

  1. it allows you to minimize taskbar programs to the tray
  2. it allows you to change the transparency of a window
  3. it allows you to change the priority of an application

and all from a neat little right click context menu!