For any windows box running 2k or higher:
http://imagemodserver.mine.nu/nick/t...ncyManager.exe
Press CTRL-AlT and a number key to set the transparency of whatever window has the focus.
1 = 10% visible, 9 = 90% visible, 0 = solid.
Source code is available here:
http://imagemodserver.mine.nu/nick/t...ncyManager.ahk
Free for all eternity to use and redistribute.
Enjoy!