Adjust taskbar preview size in Windows Vista:

Taskbar thumbnail preview in Windows Vista is a great new feature that allows you to quickly see a window without having to fully open it from the taskbar. Instead, you can just hover your mouse over the taskbar item and a small preview window will be displayed. Please note that it is possible customize the size of the preview thumbnails. Please check the link:

http://www.tweakvista.com/Article39187.aspx

You may download the Thumbnail Sizer from the link provided below:

http://mpj.tomaatnet.nl/AveThumbnailSizer.zip

Thumbnail Sizer allows the user to change the size of Vista's Window thumbnails that show when one hovers over the taskbar button for the window.