Alt+Tab Tuner gives you granular control over Windows 7's Alt+Tab preview and window-switching hot-key combo. That's pretty much all it does, but it's an incredible depth of fine-tuning.
Users can adjust the margins on the top, bottom, or side of the global preview window; change the number of columns and rows that those previews appear in; and change the amount of spacing between each preview thumbnail. Users can also tweak the program icon location and size; the preview thumbnail size; the milliseconds the global preview window takes to fade out; and the opacity of the previews' transparency.
The interface is arranged like an equalizer, with slide controls, but each toggle also allows users to type in by hand a precise setting. Because the utility uses such a familiar design, there's practically no learning curve except when trying to figure out which slider controls which aspect of the Alt+Tab preview window. Since most Windows 7 customization utilities tend to ignore the Alt+Tab hot key, Alt+Tab Tuner is a must if you're looking for precise control over Alt+Tab behavior.