Theme Switcher Reloaded is an updated and much improved version of the original Theme Switcher. Comes with a widget and can also switch themes via URL
Theme Switcher Reloaded is sponsored by Themebot for use with the demos in the WordPress Themes section on themebot.com. Coding was done by kingler of 72pines. This is an updated version of the venerable themeswitcher by Ryan Boren and Theme Switcher Widget by Jared Bangs. Theme Switcher Reloaded adds new features and enhancements.