This video shows Discount Preview in action, revealing an order total discount on the shopping cart page. (Normally, your customers have to wait until the second page of checkout to see their discounts.)
Zen Cart Switch Skin now has a second example, which shows how to do the switch automatically based on some detected value (such as, for example, whether the visitor has arrived from a mobile device).
If you are using Better Together Admin (Zen Cart or osCommerce) and getting a log message that looks like this:
Only variables should be assigned by reference in YOUR_ADMIN/includes/xajax/xajax_core/xajaxPluginManager.inc.php on line 268
PHP Strict Standards: Non-static method xajaxPluginManager::getInstance() should not be called statically, assuming $this from incompatible context in YOUR_ADMIN/includes/xajax/xajax_core/xajax.inc.php on line 269
Then please refer to the instructions for fixing this issue on the Better Together Admin help page.
The same instructions apply for Combination Discounts Admin.