AltTab

This program can be used to change the appearance of the Windows Vista/7 Alt-Tab (task switcher) window. You can change the number of rows and columns of displayed thumbnails of running programs, and change the size of the thumbnail images, window margins, gaps between rows and columns, and the position of the text at the top of the window. This program does its thing by making changes to the bowels of your computer's registry. That's a dangerous thing to do, so the program just might trash your Windows installation entirely. It never did that to my computer, nor those of my testers, but it might do it to yours. You use it entirely at your own risk.