The Zen Cart & OSCommerce AJAX POS System is getting close to having a release ready.
It works as an add-on module that hooks your OSC or Zen Database and still allows you to control attributes and information from inside OSC and Zen cart respectively. The fact that it is AJAX means you can do speedy real time lookups of customer information and orders. We have several brick and mortor stores who do millions in sales using the BETA of our system.
