Vista - Desktop Thumbnail Resizer
One of Vista’s more attractive visual features is desktop thumbnails; they’re the little images that pop up when you hover your mouse over a taskbar icon. The only trouble is they’re not very big, and there’s no facility in Windows to change the size, but no matter, there are other ways. The simplest one is to use a freeware utility called Thumbnail Sizer, and not only can you alter the size, you can also change the fade in/out time, and set it to start automatically with Windows. It’s dontationware, so give generously if you like it and want to keep using it.