Keep your site visitors on the default theme while testing new themes in your WordPress site.
Theme Test Drive is a WordPress plugin that simply make your site visitors to use default theme at the time you are testing other themes. Everything happens completely transparent and they don’t even notice that you are running a different theme for yourself. Even you can set new options to theme you are testing.
Usage: Install and activate this plugin. Use the Options page to set the theme you want to test drive, theme selected by you will only be visible to blog administrators.
Following screenshot shows the admin panel for installing and previewing themes.
Note: Before using this plugin disable WP-Cache plugin, if you are using it.