The 1.x release of the TrustCommerce payment module for Zen Cart is now available for download. TrustCommerce and PSIGate offer the only built-in modules that feature the ability to run preauth on sale. The TrustCommerce module extends this, allowing store operators to view and process complete transaction chains (preauth / postauth / refund) all from within the default Zen Cart store admin. This allows store owners to process the postauth when the order is fulfilled, avoiding chargebacks and improving customer service. If anyone is interested in merging this functionality with the current OSCommerce module, please go for it. The code is very, very similar and this module includes features I think the OSCommerce community could benefit from as well.