From ZeroHero Software:
AlphaXP Lite is a powerful system enhancement that adds advanced transparency effects to any Windows 2000/XP computer. It is part of the award-winning AlphaXP, the most advanced Windows transparency software available. Some of AlphaXP Lite's features include: a direct way to set any level of transparency to any window with a customizable keyboard shortcut, taskbar transparency with an optional mouse over fade-in effect.
Advanced Transparency, which is a set of special techniques that greatly improve Windows transparency, interface enhancements such as the ability to minimize to the system tray and use the entire program from there via an Advanced Menu system, a user friendly skin changer that works on the fly, a Web site style help file that details everything about AlphaXP Lite, start options such as start with windows and start minimized. See help file for changelog. Version 1.1.4 may include unspecified updates, enhancements, or bug fixes.