If you work with a lot of open windows in windows, then the Aero Peek preview in windows 7 allows you to see what’s happening in the background by a sneak peek through the transparent title bars and frames. You can add this feature to the full window and fully see through by making the window fully transparent.
Make Folder Backgrounds, Explorer Windows Transparent
# Peek Through (Link)
An application for Windows XP, Vista and 7 which makes the foreground window transparent with the press of Hot Keys. You may adjust the amount of transparency and the Hot Keys. You also have the ability to click through the transparent window onto the window beneath it. I have made this after releasing it seems like it should be a natural part of Windows 7.
After selecting your settings, click the Activate button, the application will then be minimized to the system tray. You may minimize the program window to send it to the system tray, or close it to exit the program. Clicking the icon in the system tray will bring the window back up. Simply pressing the Hot Keys will enable the transparency and pressing them again will remove the transparency.
# Glass2k (Link)
It is a small little program that allows Windows 2000/XP users to make any window transparent. Right-click on any window or press the keyboard shortcuts (Control + Shift + [0-9]) to make any window transparent. It’s that simple.
The new stable beta version remembers each window’s transparency settings, allows you to keep any window on top, loads on Windows startup etc. And with this latest version, you can easily make the windows taskbar transparent.