This All Banners module will display all active banners randomly in one module position. In the back-end you can configure Banner client and Banner limit (maximum amount of banners). This module does NOT increase the counter for Impressions Made, but it will register any clicked banner (in the Banner component under the column Clicks). It's a hack of mod_banners.php for Joomla's banner component.
Note: this module won't be rewritten for Joomla 1.5 because the Banner Module of Joomla 1.5 has an extensive functionality to display multiple banners.