Actual Transparent Window: Make transparent windows such as Taskbar, WinAmp and Menus in Windows 2000/Windows XP: "Actual Transparent Window is an innovative Windows transparency shell enhancement novelty - the application that allows setting any level of transparency for any individual window on the system.
Actual Transparent Window adds a new dimension to desktop space making it easy to organize simultaneously open windows without having to minimize and restore them every here and then. Along with common techniques of switching between applications windows Actual Transparent Window offers depth-based window ordering thanks to fully customizable transparency levels that are saved individually for each window.
Actual Transparent Window is intended for broad range of Windows users who value time and long for aesthetic pleasure of modern computing. Using transparent windows reduces negative effects on user's eyes as well as it allows for more native dimensional information representation model in human beings. Multiple reports by Actual Transparent Window users indicate overall increase of productivity when using several business applications that require manual information interchange simultaneously. Desktop space saved by eliminating opaque windows can be used for placing additional icons. Another great use of this program is for setting transparency depending on importance of task an application performs."
It is an interesting tweak tool. However, it seems too slow.