TaskSwitchXP

This is just too good not to share... Replaces your "old fashioned" alt-tab to a visual one for Windows XP. Developed by Alexander Avdonin

Description from the site: TaskSwitchXP is an advanced task management utility that picks up where the standard Windows Alt+Tab switcher leaves off. It provides the same functionality, and adds visual styles to the dialog and also enhances it by displaying thumbnail preview of the application that will be switched to.

Site URL: http://www.ntwind.com/software/taskswitchxp.html?
Download: http://www.ntwind.com/software/taskswitchxp/download.html

Very cool!